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A Republican senator is calling for a delay in confirming President Barack Obama’s pick for CIA director until the administration provides answers on the deadly Sept. 11 assault in Libya that killed the U.S. ambassador and three other Americans.

Sen. Lindsey Graham, a member of the Armed Services Committee, said Tuesday that his support for delaying the nomination was not a reflection on John Brennan, whom Obama tapped on Monday, but rather the only recourse to get information on the raid on the diplomatic mission in Benghazi.

“The stonewalling on Benghazi by the Obama administration must come to an end,” Graham said in a statement.

Technically, Graham is threatening to put a hold on the nomination. A hold is a parliamentary procedure which allows one or more Senators to prevent a nominee or a motion from reaching a vote on the Senate floor.

Republicans have argued that the administration tried to downplay that the attack was an act of terrorism in the weeks before the November election, even though Obama used that term in the days after the raid.