A combination image shows Democratic 2020 U.S. presidential candidate former Colorado Governor John Hickenlooper (top) and Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock (bottom) speaking on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, U.S. July 30, 2019. REUTERS/Lucas Jackson/File Pictures 

2020 Democratic U.S. presidential candidate Montana Governor Steve Bullock speaks and answers audience questions during the Presidential Gun Sense Forum in Des Moines, Iowa, U.S., August 10, 2019. REUTERS/Scott Morgan 

Gun shot survivor Megan Hobson of Miami, Florida, asks a question for Montana Governor Steve Bullock during the Presidential Gun Sense Forum in Des Moines, Iowa, U.S., August 10, 2019. REUTERS/Scott Morgan 

2020 Democratic U.S. presidential candidate Montana Governor Steve Bullock speaks and answers audience questions during the Presidential Gun Sense Forum in Des Moines, Iowa, U.S., August 10, 2019. REUTERS/Scott Morgan 

John Olsen raises his hand to ask a question to Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock at the Iowa State Fair in Des Moines, Iowa, U.S., August 8, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock is reflected in the sunglasses of John Olsen as he speaks at the Iowa State Fair in Des Moines, Iowa, U.S., August 8, 2019. REUTERS/Brian Snyder TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock speaks at the Iowa State Fair in Des Moines, Iowa, U.S., August 8, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock speaks at the Iowa State Fair in Des Moines, Iowa, U.S., August 8, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock speaks at the Iowa State Fair in Des Moines, Iowa, U.S., August 8, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock talks to the media after the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Rebecca Cook 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock pose together on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Rebecca Cook 

Democratic 2020 U.S. presidential candidate former U.S. Rep. John Delaney and Montana Governor Steve Bullock (L-R) on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock (L-R) debate on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock debate on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidate Montana Governor Steve Bullock speaks on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock stand at their podiums during the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates stand on stage (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates stand for the national anthem (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock pose together before the start of the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock applaud as they pose together before the start of the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock pose together on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Rebecca Cook 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney, Montana Governor Steve Bullock pose together on the first night of the second 2020 Democratic U.S. presidential debate in Detroit, Michigan, July 30, 2019. REUTERS/Rebecca Cook 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock pose together before the start of the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock pose together before the start of the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson 

Twenty four 2020 Democratic presidential candidates are seen in a combination from file photos (L-R top row): U.S. Senators Bernie Sanders, Kamala Harris, Elizabeth Warren, Cory Booker, Amy Klobuchar, Kirsten Gillibrand, Michael Bennet and former U.S. Senator Mike Gravel. (L-R middle row): Former Texas congressman Beto O'Rourke, U.S. Representatives Tulsi Gabbard, John Delaney, Eric Swalwell, Tim Ryan, Seth Moulton, former HUD Secretary Julian Castro and former U.S. Vice President Joe Biden. (L-R bottom row): Mayor Pete Buttigieg, Former Gov. John Hickenlooper, Gov. Jay Inslee, Andrew Yang, Marianne Williamson, Mayor Wayne Messam, Montana Gov. Steve Bullock and New York City Mayor Bill de Blasio. REUTERS/Files 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to patrons of the Ten Mile Brewery as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock with his wife Lisa Bullock before he speaks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock hugs a student after speaking to the media and students at Helena High School as he launches 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Twenty two 2020 Democratic presidential candidates are seen in a combination from file photos (L-R top row): U.S. Senators Bernie Sanders, Kamala Harris, Elizabeth Warren, Cory Booker, Amy Klobuchar, Kirsten Gillibrand, and Michael Bennet. (L-R middle row): Former Texas congressman Beto O'Rourke, U.S. Representatives Tulsi Gabbard, John Delaney, Eric Swalwell, Tim Ryan, Seth Moulton, former HUD Secretary Julian Castro and former U.S. Vice President Joe Biden. (L-R bottom row): Mayor Pete Buttigieg, Former Gov. John Hickenlooper, Gov. Jay Inslee, Andrew Yang, Marianne Williamson, Mayor Wayne Messam, and Montana Gov. Steve Bullock. REUTERS/Files 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Governor Steve Bullock talks to the media as he launches a 2020 U.S. presidential campaign in Helena, Montana, U.S., May 14, 2019. REUTERS/Jim Urquhart 

Montana Gov. Steve Bullock gives a toast at the Governors' Ball, in the State Dining Room of the White House, in Washington, U.S., February 24, 2019. REUTERS/Al Drago 

U.S. President Donald Trump walks to his seat as Montana Gov. Steve Bullock gives a toast at the Governors' Ball, in the State Dining Room of the White House, in Washington, U.S., February 24, 2019. REUTERS/Al Drago 

U.S. President Donald Trump chats with Montana Gov. Steve Bullock's son, Cameron, after addressing the nation's governors, in town for their Annual Winter Meetings, as he hosts the Governor's Ball at the White House, Washington, DC, U.S., February 25, 2018. REUTERS/Mike Theiler 

Steve Bullock, Governor of Montana, speaks during the Milken Institute Global Conference in Beverly Hills, California, U.S., May 1, 2017. REUTERS/Mike Blake 

Steve Bullock, Governor of Montana, speaks during the Milken Institute Global Conference in Beverly Hills, California, U.S., May 1, 2017. REUTERS/Mike Blake