U.S. Capitol security hold the elevator as senators attend a vote a the Senate Chamber at the U.S. Capitol in Washington, January 20, 2016. Members of the U.S. Congress have been spending fewer days working in Washington since the late 2000s, according to a Reuters review of congressional records going back 18 years. Picture taken January 20, 2016. To match Insight USA-CONGRESS/WORKINGDAYS REUTERS/Carlos Barria