The unusual testimony by Mr. Crocker to the Foreign Relations Committee was shown on four large flat-screen televisions pointed at senators and the gallery. But the session was plagued by repeated technical difficulties that disrupted both the image and the sound.

“Baghdad, can you hear the U.S. Senate?” Mr. Biden said into his microphone at one point when the communications with Mr. Crocker went silent.

An activist for the Code Pink antiwar movement shouted from the gallery, “Senate, can you hear the American people?”

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