WASHINGTON (AP) - John Brennan's nomination to be director of the CIA is set for a key test before the Senate Intelligence Committee.

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The committee is scheduled to vote Tuesday on Brennan, who is currently serving as President Barack Obama's top counterterrorism adviser in the White House.

Brennan's nomination to lead the spy agency has been held up by demands from Democrats and Republicans for more details about the classified Justice Department legal opinions that justify the use of unmanned spy planes to terrorist suspects overseas, including American citizens, and about the attack on the U.S. diplomatic mission in Libya.

Obama nominated Brennan to be CIA director in early January. If the intelligence committee, which is controlled by the Democrats, approves the nomination, it would then move to the full Senate for consideration.