The oral arguments follow a series of party-line votes in which Senate Republicans turned back Democrats’ attempts to subpoena documents and compel White House officials to testify.

The debate lasted more than 12 hours, and became so acrimonious that Chief Justice John Roberts reminded the impeachment managers and the president’s lawyers to “remember where they are” and return to “civil discourse.”

The details: Read excerpts from the articles of impeachment and see how the parties diverge on the facts.

Closer look: The trial camerawork is basic, but our TV critic found the ritual striking.

Related: Mr. Trump criticized his political enemies, including “corrupt” Democrats, during a wide-ranging news conference today before he left Davos, Switzerland.

Another angle: Mr. Trump’s legal team has argued that abuse of power is not an impeachable offense, a position contradicted by many legal experts, including, at one point, Attorney General William Barr. In 2018, while in private practice, Mr. Barr wrote a memo saying that presidents who misused their authority were subject to impeachment.