The Senate Armed Services Committee on Thursday narrowly approved a bill that would limit detainee transfers from the Guantánamo Bay detention camp.

The bill, sponsored by Sen. Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (R-N.H.), passed on a 14-12 vote during a closed markup session.

The bill would extend and strengthen prohibitions on any transfers or releases. President Obama is seeking to close the prison before he leaves office. If he succeeds he will have fulfilled, albeit belatedly, a 2008 campaign pledge.

The White House said earlier in the day that Obama would veto Ayotte’s bill if Congress were to pass it.

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The bill would suspend the transfer of high- or medium-risk terror suspects, and prohibit the president from sending a detainee to any country where a former Guantánamo prisoner had previously been returned, only to reengage in terrorist activities.

It would also repeal an existing law that gives the president authority to transfer detainees, and reinstate a ban on detainees being returned to Yemen, which is currently undergoing a tumultuous and violent political transition.

The bill is also backed by Senate Armed Services Committee Chairman John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.), Sen. Lindsey Graham (R-S.C.) and Senate Intelligence Committee Chairman Richard Burr (R-N.C.).

"When the administration transfers a Guantanamo detainee, especially those formerly assessed as a high or medium risk for reengagement in terrorism, the onus is on the administration to explain openly to the American people what has changed — particularly when nearly 30 percent of former Guantanamo detainees are suspected or confirmed of reengaging in terrorism," Ayotte said in a statement.

"It is a simple matter of transparency and honesty with the American people. I look forward to the consideration of our legislation by the full Senate,” she said.

Some Democrats on the committee added amendments. One by Sen. Tim Kaine (D-Va.) would seek to ensure that detainees are treated humanely.

Another, by Sen. Claire McCaskill Claire Conner McCaskillDemocratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally Missouri county issues travel advisory for Lake of the Ozarks after Memorial Day parties MORE (D-Mo.), would require a report about the use of Pentagon facilities as terrorist propaganda tools.

An amendment by Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.) would allow the temporary transfer of a detainee to a Department of Defense facility in the United States for emergency or critical medical treatment.

—Justin Sink contributed