Lawmakers push to interview ex-White House aide in 'Fast and Furious'

Two top Republican lawmakers investigating the Fast and Furious controversy are demanding the White House make a former aide available for testimony to see whether the scandal reached the upper echelons of the administration, according to a letter obtained by Fox News.

Rep. Darrell Issa, R-Calif., and Sen. Charles Grassley, R-Iowa, fired off the letter Wednesday urging the White House to make available Kevin O'Reilly, a former National Security Council staffer who is currently stationed in Iraq for the State Department.

The lawmakers are giving White House staffers the deadline of April 4 to respond, with Republican aides privately saying the back-and-forth could provoke a showdown over executive privilege if the administration tries to shield O'Reilly from talking to investigators.

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