This really interesting story is by Michael Waldman in Brennan Center for Justice:

A State of the Union address is among the few remaining civic rituals. Its purpose is outlined in the Constitution, and millions still tune in to watch. An impeachment trial, too, is a civic ritual. Like the big speech, it’s also in the Constitution.

Now the State of the Union, planned for next Tuesday, and impeachment could collide. Both sides seem to be nervously gaming the schedule with that question in mind. If John Bolton is called as a witness, President Trump’s speech will be held in the middle of the trial. Or it will come just days after the Senate votes to quickly acquit.

I was Bill Clinton’s chief speechwriter in 1999, when he gave the address in the middle of his own impeachment trial. Clinton was wildly popular, and impeachment widely disliked. The senators had to adjourn the proceedings, trudge over to the House chamber, and listen to Clinton give a soaring, ebullient speech. That year, the State of the Union was … weird.

Read the full perspective here.