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This is the CBS Evening News with Nora O'Donnell, reporting from the nation's capital.

Good evening, and thank you so much for joining us. And as we come on the air tonight, the impeachment

trial of President Trump is now underway. It has been a day of accusations and anger on the floor

of the Senate. Democrats are charging the Majority Leader Mitch McConnell with orchestrating

a cover-up, saying he is trying

to force senators to hold the trial late at night when Americans won't be watching.

Well, tonight McConnell is backing down after objections from several moderate members of his own party.

As Democrats continue to push for witnesses to be allowed to testify. It's been an extraordinary day

of public debate and behind the scenes maneuvering in a place that likes to call itself the world's

greatest deliberative body. Chip Reed leads off our coverage tonight from Capitol Hill.

The impeachment debate began today before the Senate even convened.

McConnell's resolution is nothing short of a national disgrace.

Democratic leader Chuck Schumer lambasted Majority Leader Mitch McConnell's plan

to cram 24 hours of opening arguments for each side into just two days,

forcing much of the debate to happen after midnight.

He pushes the arguments into the wee hours of the night, so American people won't see them.

But shortly after, Chief Justice John Roberts gaveled in the trial, the Senate clerk surprised almost everyone.

For a period of time not to exceed 24 hours over up to three session days.

Yes, a new plan, three days instead of two for each side.

McConnell agreed to make the handwritten change after some Republicans,

...