People watch from a sidewalk across the street for U.S. President Barack Obama to walk back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (L) stops to shake hands with a Washington Metropolitan Police officer as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama passes a gift shop as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama waves to onlookers as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (R) calls to reporters to move their microphones farther away as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (L) waves off reporters with microphones as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (C) calls to reporters to move their microphones farther away as he walks back to the White House following a nearby luncheon in Washington, October 26, 2015. The luncheon was sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (R) walks with White House Legislative Affairs Director Katie Fallon (2nd R) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama walks with White House Legislative Affairs Director Katie Fallon (L) and Chief of Staff Denis McDonough (R) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (2nd L) walks with White House Legislative Affairs Director Katie Fallon (L) and Chief of Staff Denis McDonough (R) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama walks with White House Legislative Affairs Director Katie Fallon (L) and Chief of Staff Denis McDonough (R) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

Reporters walk alongside as U.S. President Barack Obama (2nd L) walks with White House Legislative Affairs Director Katie Fallon (L) and Chief of Staff Denis McDonough (3rd L) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

U.S. President Barack Obama (2nd L) waves to onlookers as he walks with White House Legislative Affairs Director Katie Fallon (L) and Chief of Staff Denis McDonough (R) to a luncheon near the White House in Washington, October 26, 2015. The luncheon is sponsored by former U.S. Senators Tom Daschle (D-SD) and George Mitchell (D-ME). REUTERS/Jonathan Ernst

Former U.S. Senate majority leaders Tom Daschle (D-SD) (L-R) and Trent Lott (R-MS), with Ted. Kennedy Jr., laugh during remarks at the dedication ceremony for the Edward M. Kennedy Institute for the United States Senate, in Boston March 30, 2015. REUTERS/Jonathan Ernst

Former U.S. Senator Tom Daschle (D-SD) speaks at the Center for American Progress' 2014 Making Progress Policy Conference in Washington November 19, 2014. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS)

Former Senator Tom Daschle pauses as he speaks at the funeral service for former Democratic U.S. Senator and three-time presidential candidate George McGovern at the Washington Pavilion of Arts and Science in Sioux Falls, South Dakota October 26, 2012. McGovern died Sunday in his native South Dakota at age 90. REUTERS/Nati Harnik/Pool (UNITED STATES - Tags: OBITUARY POLITICS)

Former U.S. Senate Majority Leader Tom Daschle places a hand on the casket of George McGovern at a funeral service for the former Democratic U.S. Senator and three-time presidential candidate at the Washington Pavilion of Arts and Science in Sioux Falls, South Dakota October 26, 2012. McGovern died October 21, 2012, in his native South Dakota at age 90. REUTERS/Nati Harnik/Pool (UNITED STATES - Tags: OBITUARY POLITICS)

Former U.S. Senator Tom Daschle speaks during funeral services for former Democratic U.S. Senator and three-time presidential candidate George McGovern at the Washington Pavilion of Arts and Sciences in Sioux Falls, South Dakota October 26, 2012. McGovern died October 21, 2012, in his native South Dakota at age 90. REUTERS/M. Spencer Green/Pool (UNITED STATES - Tags: OBITUARY POLITICS)

Former U.S. Senator Tom Daschle (R) smiles during a prayer service for former U.S. Democratic Senator and three-time presidential candidate George McGovern at the First United Methodist Church in Sioux Falls, South Dakota October 25, 2012. McGovern died Sunday in his native South Dakota at age 90. REUTERS/M. Spencer Green/Pool (UNITED STATES - Tags: POLITICS OBITUARY)

(L-R) Daughters of George McGovern, Ann McGovern and Susan Rowen, U.S. Vice President Joe Biden, his son Hunter Biden, and Tom Daschle laugh as they listen to Matt McGovern, grandson of George McGovern, at a prayer service for former U.S. Democratic Senator and three-time presidential candidate George McGovern at the First United Methodist Church in Sioux Falls, South Dakota October 25, 2012. McGovern died Sunday in his native South Dakota at age 90. REUTERS/Nati Harnik/Pool (UNITED STATES - Tags: POLITICS OBITUARY)

Former Senate Majority Leader Tom Daschle (L) shakes hands with former Governor of Florida Charlie Crist during the University of Southern California's Schwarzenegger Institute for State and Global Policy inaugural Symposium in Los Angeles, California, September 24, 2012. REUTERS/Gus Ruelas (UNITED STATES - Tags: EDUCATION POLITICS)

Former Senate Majority Leader Tom Daschle talks during the University of Southern California's Schwarzenegger Institute for State and Global Policy inaugural Symposium in Los Angeles, California, September 24, 2012. REUTERS/Gus Ruelas (UNITED STATES - Tags: POLITICS EDUCATION)

Former Senate Majority Leader Tom Daschle talks during the University of Southern California's Schwarzenegger Institute for State and Global Policy inaugural Symposium in Los Angeles, California, September 24, 2012. REUTERS/Gus Ruelas (UNITED STATES - Tags: POLITICS EDUCATION)

Senator John McCain reacts to a remark from former Senate Majority Leader Tom Daschle (R) during the University of Southern California's Schwarzenegger Institute for State and Global Policy inaugural Symposium in Los Angeles, California, September 24, 2012. REUTERS/Gus Ruelas (UNITED STATES - Tags: POLITICS EDUCATION)

Former Democratic Senate Majority Leader Tom Daschle (R) and his lobbyist wife Linda Hall Daschle pose for photographers as they arrive on the red carpet of the Kennedy Center for the Performing Arts, for the evening's gala to honor the 2009 Kennedy Center Honorees, in Washington, December 6, 2009. REUTERS/Mike Theiler (UNITED STATES POLITICS ENTERTAINMENT)

White House Press Secretary Robert Gibbs makes a point during a press briefing at the White House in Washington February 3, 2009. Former Senate Majority Leader Tom Daschle withdrew his nomination as President Barack Obama's health secretary on Tuesday, saying he did not want to be a distraction after tax errors forced him to pay $140,000 in back taxes.
REUTERS/Kevin Lamarque (UNITED STATES)

White House Press Secretary Robert Gibbs looks down during a press briefing at the White House in Washington February 3, 2009. Former Senate Majority Leader Tom Daschle withdrew his nomination as President Barack Obama's health secretary on Tuesday, saying he did not want to be a distraction after tax errors forced him to pay $140,000 in back taxes.
REUTERS/Kevin Lamarque (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle (R) as Secretary of the Department of Health and Human Services during a news conference in Chicago, in this file photo from December 11, 2008. Daschle withdrew his nomination as President Barack Obama's health secretary February 3, 2009, saying he did not want to be a distraction after paying $140,000 in back taxes. REUTERS/Jeff Haynes/Files (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle speaks to the media after meeting with Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle speaks to the media after meeting with Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle speaks to the media after meeting with Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle (C) leaves after a meeting with the Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle (R) arrives for a meeting with the Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Chairman of the Senate Finance Committee Max Baucus (D-MT) arrives for a meeting of the committee with Secretary-designate for Health and Human Services Tom Daschle (not pictured) about Daschle's pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Chairman of the Senate Finance Committee Max Baucus (D-MT) arrives for a meeting of the committee with Secretary-designate for Health and Human Services Tom Daschle (not pictured) about Daschle's pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Secretary-designate for Health and Human Services Tom Daschle (R) arrives for a meeting with the Senate Finance Committee about his pending nomination on Capitol Hill in Washington February 2, 2009. Daschle, President Barack Obama's choice to lead reforms of the costly U.S. healthcare system, said on Monday he was deeply embarrassed about having to pay some $140,000 in back taxes, a lapse that raised questions about his nomination. REUTERS/Joshua Roberts (UNITED STATES)

Former U.S. Senate Majority Leader Bob Dole (L) listens to former U.S. Sen. Tom Daschle (D-SD) testify before the Senate Health, Education, Labor and Pensions Committee hearing about his confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

Former U.S. Senate Majority Leader Bob Dole speaks on behalf of former U.S. Sen. Tom Daschle (D-SD) at the Senate Health, Education, Labor and Pensions Committee hearing about Daschle's confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

Former U.S. Senate Majority Leader Bob Dole listens to former U.S. Sen. Tom Daschle (D-SD) testify before the Senate Health, Education, Labor and Pensions Committee hearing about his confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

Former U.S. Sen. Tom Daschle (D-SD) testifies before the Senate Health, Education, Labor and Pensions Committee hearing about his confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

Former U.S. Sen. Tom Daschle (D-SD) testifies before the Senate Health, Education, Labor and Pensions Committee hearing about his confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

Former U.S. Senator Tom Daschle (D-SD) testifies before the Senate Health, Education, Labor and Pensions Committee hearing about his confirmation for Secretary of Health and Human Services on Capitol Hill in Washington, January 8, 2009. REUTERS/Larry Downing (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle (R) as nominee for Secretary of the Department of Health and Human Services during a news conference in Chicago in this file image taken December 11, 2008. Daschle testifies at his Senate confirmation hearing on January 8, 2009 -- beginning a process to change the nation's healthcare that could be one of the most ambitious and expensive undertakings of the Obama presidency. To match feature USA-OBAMA/HEALTHCARE REUTERS/Jeff Haynes/Files (UNITED STATES)

U.S. President-elect Barack Obama walks away with Jeanne Lambrew (L), who will serve as deputy director of the new White House office of Health Reform, and former U.S. Senate Majority Leader Tom Daschle (C) who was introduced as nominee for secretary of the Department of Health and Human Services at a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama speaks during a news conference where he introduced former U.S. Senate Majority Leader Tom Daschle as nominee for secretary of the Department of Health and Human Services in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama speaks during a news conference where he introduced former U.S. Senate Majority Leader Tom Daschle as nominee for secretary of the Department of Health and Human Services in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (R) introduces former U.S. Senate Majority Leader Tom Daschle (L) as Secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle on Wednesday as secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle (C) as nominee for secretary of the Department of Health and Human Services while Jeanne Lambrew (L), who will serve as deputy director of the new White House office of Health Reform listens during a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle (R) as nominee for Secretary of the Department of Health and Human Services during a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle as nominee for secretary of the Department of Health and Human Services during a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (L) introduces former U.S. Senate Majority Leader Tom Daschle on Wednesday as secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

Jeanne Lambrew, who will serve as deputy director of the new White House office of Health Reform, listens as U.S. President-elect Barack Obama introduces former U.S. Senate Majority Leader Tom Daschle as nominee for secretary of the Department of Health and Human Services during a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

Former U.S. Senate Majority Leader Tom Daschle listens as he is introduced by U.S. President-elect Barack Obama as nominee for secretary of health and human services during a news conference in Chicago December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (L) introduces former U.S. Senate Majority Leader Tom Daschle (R) as Secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (L) shakes hands with former U.S. Senate Majority Leader Tom Daschle after introducing Daschle as nominee for secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (L) introduces former U.S. Senate Majority Leader Tom Daschle (R) on Wednesday as Secretary of the Department of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

U.S. President-elect Barack Obama (L) introduces former U.S. Senate Majority Leader Tom Daschle (R) as nominee for Secretary of Health and Human Services during a news conference in Chicago, December 11, 2008. REUTERS/Jeff Haynes (UNITED STATES)

Former Senate Majority Leader Tom Daschle (D-SD), nominated to be the next secretary of Housing and Urban Development (HUD), and his wife Linda Hall hold hands as they arrive for the 2008 Kennedy Center Honors Gala at the Kennedy Center in Washington, December 7, 2008. The 31st Annual Kennedy Center Honors awards are given for lifetime achievement in the performing arts. REUTERS/Mike Theiler (UNITED STATES)