The Democratic-led Senate blocked the motion in a 55-45 vote.
Forty-five Senate Republicans backed a failed effort on Tuesday to halt former President Donald Trump's impeachment trial, in a show of party unity that some cited as a clear sign he will not be convicted of inciting insurrection at the Capitol.
Republican Senator Rand Paul made a motion on the Senate floor that would have required the chamber to vote on whether Trump's trial in February violates the U.S. Constitution, Reuters reported.
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The Democratic-led Senate blocked the motion in a 55-45 vote. But only five Republican lawmakers joined Democrats to reject the move, far short of the 17 Republicans who would need to vote to convict Trump on an impeachment charge that he incited the January 6 Capitol assault that left five people dead.
"It's one of the few times in Washington where a loss is actually a victory," Paul later told reporters. "Forty-five votes means the impeachment trial is dead on arrival."