The basics.

What we’re expecting to see: The Senate is set to vote Wednesday on two articles of impeachment against President Trump. The first charges him with abusing the power of his office by pressuring Ukraine to interfere in the 2020 presidential election on his behalf by withholding military aid and a White House meeting; the other charges him with obstructing Congress in a bid to hide his wrongdoing.

When we’re likely to see it: The votes — one for each article of impeachment — are expected to begin at 4 p.m. Eastern. In the morning, senators will take to the Senate floor to explain their decisions to either convict or acquit Mr. Trump.

How to follow it: The New York Times’s congressional and White House teams will be following all of the day’s developments. Visit nytimes.com for a live stream and vote tracker of the proceedings.

Will any Democrats break ranks to acquit on one or both charges?

With Republicans standing in lock step to acquit Mr. Trump, all eyes on Wednesday afternoon will be on Senate Democrats in search of any defections. The president and other Republicans would love nothing more than to be able to trumpet a bipartisan acquittal.