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Republicans don't have votes yet to block impeachment witnesses
The trial will now enter a question-and-answer phase over the next two days.
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Stefan Becket is a managing editor of politics for CBSNews.com. He has covered national politics and the federal government for more than a decade. He got his start in journalism at New York Magazine before joining the news start-up Mic to build the site's politics and policy section.
Stefan joined CBS News in 2017 in New York and moved to Washington two years later to help oversee a team that covers the White House, Congress, political campaigns, the Supreme Court and federal law enforcement.
The trial will now enter a question-and-answer phase over the next two days.
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 Democratic House managers focused on the constitutional basis for removing the president from office for abusing his power.
The House managers presented their case against the president on charges of abuse of power and obstruction of Congress.
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.
The chief justice of the Supreme Court and senators swore an oath to administer "impartial justice" in the upcoming trial.
House impeachment managers marched across the Capitol to hand off the Trump impeachment case to the Senate.
House and Senate leaders traded heated accusations the day after the vote to impeach President Trump.
The House voted to impeach President Trump for abuse of power and obstruction of Congress after nearly eight hours of bitter debate.
The debate will last six hours, and there will be no amendments.
With the House poised to impeach the president, Senate Democrats are working to shape an eventual trial.
Monday's hearing was the first since Speaker Nancy Pelosi said the House will move forward with drafting articles of impeachment.
Wednesday's hearing features testimony from four constitutional law experts on the historical basis for impeachment.
Morrison was the third witness testifying Tuesday who listened in on Trump's July 25 call with Ukrainian President Volodymyr Zelensky