WASHINGTON (AP) — President Barack Obama's choice of John Brennan to be the next CIA director hit a snag Tuesday as a Republican senator threatened to delay the nomination until the Obama administration provides answers on the deadly assault in Libya that killed the U.S. ambassador and three other Americans.

Sen. Lindsey Graham, whose opposition helped scuttle U.N. Ambassador Susan Rice's hopes of becoming secretary of state, said the Senate should not confirm any Obama nominee for the nation's top spy post until the administration elaborates on the attack on the diplomatic mission in Benghazi.

"My support for a delay in confirmation is not directed at Mr. Brennan, but is an unfortunate, yet necessary, action to get information from this administration," the South Carolina senator said in a statement. "I have tried — repeatedly — to get information on Benghazi, but my requests have been repeatedly ignored."

He added that the administration's "stonewalling on Benghazi" must end.

Graham did not explicitly say he would put a "hold" on Brennan's nomination, and his office declined further comment. However, his statement signaled that he would try to slow the nomination.

The White House dismissed the politicization of the issue and pressed for the Senate to act quickly and deliberately on Brennan's nomination.