In a speech marking the fifth anniversary of the creation of the Department of Homeland Security, Bush said U.S. officials have helped foil numerous planned attacks, including a plot to fly an airplane into the tallest building on the West Coast and another to blow up trans-Atlantic passenger jets.

"The enemy remains active — deadly in its intent — and in the face of this danger, the United States must never let down its guard," Bush said.

Bush continued to pressure the House to act on Senate-passed legislation needed to renew an intelligence law that governs how the government can eavesdrop on suspected terrorists. The law expired Feb. 16 and the House and Senate have yet to reconcile different versions of a new intelligence bill.