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Alan Dershowitz addressed new claims from former national security adviser John Bolton, saying that even if they are true, the president's actions still don't rise to the level of an impeachable offense.
The signing will come in the middle of the Senate impeachment trial.
The Democratic House managers focused on the constitutional basis for removing the president from office for abusing his power.
"I'd love to be able to do that deal. They say that's the hardest of all deals," the president said of peace in the Middle East.
The House managers presented their case against the president on charges of abuse of power and obstruction of Congress.
The attorney general for Washington, D.C., claims the president's inaugural committee was improperly used to enrich the Trump family.
The first day of President Trump's trial was peppered with contentious exchanges over hearing from new witnesses.
The president's legal team laid out its arguments against impeachment, and the Senate Republican leadership released the rules governing the trial.
Alan Dershowitz, a longtime Democrat who often defends the president on television, is also joining the team.
The secretary of state said he had been previously unaware of any surveillance on the former U.S. ambassador to Ukraine.
The chief justice of the Supreme Court and senators swore an oath to administer "impartial justice" in the upcoming trial.
After name-checking members of Congress and business leaders and riffing on his favorite topics, the president signed the long-awaited trade agreement.
It's the first debate of 2020 and the final debate before the Iowa caucuses.
The removal comes as the U.S. is set to sign a "Phase One" trade deal with China on Wednesday.
Trump says he might have to invoke executive privilege to keep former national security adviser John Bolton from testifying in his Senate impeachment trial.