engel, thanks. as you heard, the u.s. actively participated in defending against the iranian strike as the president and vice president kept a close watch on the situation. here is peter alexander. >> reporter: president biden tonight declaring iran's major assault on israel a failure. >> the attack appears to have been defeated and ineffective. >> reporter: the president crediting the u.s.'s extensive planning in anticipating today's attack and working alongside its close ally israel. >> make no mistake. the united states is fully, fully, fully supportive of israel. >> reporter: earlier president biden along with vice president harris monitoring the attack alongside their national security team from the situation room. the white house says iran did not give any advance notice of today's missile barrage. it comes as the biden administration's months' long effort to prevent a larger war in the middle east is now facing its toughest test yet. the president tonight saying it remains...