U.S. House Speaker Republican John Boehner has asked President Barack Obama for a clear explanation of the legal standing supporting his administration’s continued military involvement in Libya.

The Speaker warned that Obama will be in violation of the War Powers Resolution after this Sunday, unless Congress authorizes the military campaign in Libya, or unless US forces withdraw..

This Sunday marks the 90th day since Obama notified Congress that American troops would help to enforce a no-fly zone over Libya.

Earlier this month, the House defeated a proposal on a non-binding resolution that would have required the U.S. to pull out of Libya within fifteen days.

The White House has defended itself saying it has abided by the war powers law by providing briefings on the deployment of US personnel in the Libya campaign.

However, the Obama administration has never asked Congress for approval.

NATO has been pounding military targets of Libyan leader Moammar Gaddafi for months in order to protect civilians from his armies and to pressure him to quit.

Members of Obama’s own Democrat party have also questioned the legality of the missile strikes in Libya.