White House move sets off lawmaker questions over 'Fast and Furious'

Republican leaders in both chambers are raising sharper questions about the White House's involvement in the controversial "Fast and Furious" program after President Obama invoked executive privilege to withhold documents from Republican investigators.

Both the White House and U.S. Attorney General Eric Holder have claimed repeatedly that high-level officials - both in the Department of Justice and in the White House - were unaware of the nature of the botched program, which put firearms into the hands of known gun-runners in an effort to trace them to drug-smugglers along the Mexican border. But with the White House moving unilaterally Wednesday to assert executive privilege over documents sought by the House Oversight and Government Reform Committee, Republicans have grown more suspicious that those officials knew more than they've claimed. 

Sen. Chuck Grassley (Iowa), the senior Republican on the Senate Judiciary Committee, said the administration's maneuver "raises monumental questions" about who knew what - and when. 

"How can the president assert executive privilege if there was no White House involvement? How can the president exert executive privilege over documents he's supposedly never seen?" Grassley, who met with Holder Tuesday night, said Wednesday in a statement. "Is something very big being hidden to go to this extreme? ... The questions from Congress go to determining what happened in a disastrous government program for accountability and so that it's never repeated again."

The office of House Speaker John Boehner (R-Ohio) was quick to raise similar concerns.

"Until now, everyone believed that the decisions regarding ‘Fast and Furious' were confined to the Department of Justice," Boehner spokesman Michael Steel said in an email. "The White House decision to invoke executive privilege implies that White House officials were either involved in the ‘Fast and Furious' operation or the cover-up that followed. 

"The administration has always insisted that wasn't the case," Steel added. "Were they lying, or are they now bending the law to hide the truth?"

Launched by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), the Fast and Furious program was designed to battle drug dealers by following guns from the border states into Mexico. But the agency lost track of hundreds of those guns, and several were linked to the murder of an Arizona border patrol agent in late 2010.

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