Sen. Marco Rubio (R) of Florida called on US Attorney General Eric Holder to resign Thursday.Speaking at a Monitor hosted breakfast, the freshman senator was responding to the Obama administration's decision Wednesday to claim executive privilege in refusing to hand over Justice Department documents to a congressional committee investigating a failed anti  gun trafficking operation."I think we've about reached the point of no return on this issue," Senator Rubio said Thursday, after replying "yes" to a reporter's question on whether he believes Mr. Holder should step down. "I think they've been given multiple opportunities to answer very legitimate questions that the Congress has."

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