The basics.

What we’re expecting to see: A first look at how the president’s defense strategy will play out in the Senate, and at the confrontational approach his lawyers seem prepared to take in their full formal arguments next week.

When we’re likely to see it: The Senate has asked Mr. Trump’s team to begin at 10 a.m. and limit itself to three hours.

How to follow it: The New York Times’s congressional and White House teams will be following all of the developments. Visit nytimes.com for coverage throughout the day.

A three-hour trailer?

On Friday, Jay Sekulow, a member of Mr. Trump’s legal team, characterized the presentation he and his colleagues plan to make on Saturday as “a trailer” and “coming attractions.” He added that the more meaningful and substantial presentation of his team’s case will be reserved for next week.

Nonetheless, the president’s lawyers will have three hours, and anything they say will resonate over the weekend and could be seized on by Democratic presidential candidates who will be campaigning aggressively ahead of the Iowa caucuses on Feb. 3.