The House and Senate must now try to merge their two defense policy bills.
The moves bring the prison’s population down to 116, from 242 when Obama took office.
The wide-ranging bill includes policy restrictions on Cuba, immigration and marijuana.
Obama's 2008 rival says he has a "workable solution" for the controversial prison.
Does the president feel sick to his stomach over his decision to trade five Taliban prisoners for...
The facility is "one of our most effective counterterrorism tools," Cotton said.
The report finds a number of prisoners will return to terrorism if they are transferred.
The visit comes as Obama steps up efforts to close the prison.
A man in the Bergdahl swap has reportedly sought to return to militancy.
Sen. Ron Johnson (R-Wis.) criticized President Obama’s policy to combat terror groups.
The Joint Chiefs of Staff chairman called for the facility to be closed.
The agreement the U.S. has with Cuba over Guantánamo Bay prison could be revisited.
The White House has threatened to veto the Intelligence Authorization Act.
The House is now halfway through the 12 annual spending bills.
A spending bill maintains the current prohibition on transferring Gitmo detainees to the U.S.
The proposal would aim to close the facility by the end of 2017.
The bill would apply to detainees released after Feb. 1 of this year.
Counterterrorism is complicated, and calling it war does not make it any less so.
Measure would restrict the options available to President Obama.
Outgoing Defense secretary reveals disagreements with administration.
"This isn't a simple, easy matter of let's just move 122 detainees," he said.
Rep. Mac Thornberry said lawmakers should act to prevent Obama from releasing more prisoners.
The president's efforts to close the prison camp have picked up pace.
The Guantanamo Bay prison camp is located in Cuba.