The impeachment drama is about to enter a new phase: the Senate trial. But the fight over what rules will govern the proceedings continues. The White House now wants to preserve the option of moving to swiftly dismiss the charges against President Donald Trump after opening arguments. Meanwhile, Senate Minority Leader Chuck Schumer is working to keep his conference unified. CNN political director David Chalian and CNN senior Washington correspondent Jeff Zeleny also delve into the 2020 race as tensions emerge between Senators Bernie Sanders and Elizabeth Warren.

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