CNN's Jeremy Diamond reports President Donald Trump went on a tweetstorm and raged against impeachment as he was watching the first day of the impeachment trial in the Senate.

Late-night TV hosts Jimmy Fallon, Stephen Colbert, Jimmy Kimmel and Trevor Noah mock the Senate over the rules in the impeachment trial of President Donald Trump.

Before the nation moves on from the tense exchanges over rules for the Senate impeachment trial of President Donald Trump, there is a question still to be answered: What in the world does pettifogging mean?

Following remarks by impeachment manager Rep. Jerry Nadler (D-NY) and White House counsel Pat Cipollone, Chief Justice John Roberts warned both teams about using rhetoric inappropriate for an impeachment trial in the Senate chamber.

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Democrats on Tuesday proposed subpoenaing former national security adviser John Bolton through an amendment to the organizing resolution to set the rules for the impeachment trial of President Donald Trump. Read that amendment below:

Senate Minority Leader Chuck Schumer proposed a series of amendments Tuesday, including one aimed at preventing the selective admission of evidence into the Senate impeachment trial of President Donald Trump. Read that amendment below:

The Senate impeachment trial of President Donald Trump has begun. Here's what happened today that you need to know.

White House deputy counsel Michael Purpura and Rep. Adam Schiff (D-CA), one of the impeachment managers, debate the details of President Donald Trump's call with Ukrainian President Volodymyr Zelensky and when exactly Ukraine found out that there was going to be a freeze in funding for aid.

CNN Opinion is curating commentators' smartest takes on the first day of President Donald Trump's Senate impeachment trial. The views expressed below are their own.