The decision could define the party and shape American democracy for generations to come.
The impeachment measure is likely to sail through the Democratic-led House, with or without Republican support.
And for some who want to make a break from Trump and chart a new path for the Republican Party, time is running short.
The outcome may center on Senate Majority Leader Mitch McConnell, R-Ky., a Trump ally who broke with him on Jan. 6 when making an impassioned plea to affirm President-elect Joe Biden's victory.
"I think there is a sizeable majority in both chambers that desires an outcome where Trump cannot run for public office again," Cooper said.
Liz Cheney, Donald Trump, John Katko, Adam Kinzinger of, Fred Upton of, Jaime Herrera Beutler, Jan, Liam Donovan, Mitch McConnell, Trump, Joe Biden's, aren't, McConnell, it's, Rory Cooper, Mike Pence, Pence, Andy Biggs, Cooper
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Wyoming, New York, Adam Kinzinger of Illinois, Fred Upton of Michigan, Washington, Ky, Arizona, Pennsylvania