Pelosi's letter came just two days after she led the House of Representatives in impeaching Trump, and his SOTU speech could well take place in the middle of his Senate trial.
The entire month of January remains in limbo on the Senate's calendar, though Senate Majority Leader Mitch McConnell (R-Ky.) told members to "be back and voting on Monday, Jan. 6." Further complicating matters is Pelosi's decision to delay naming the House's impeachment managers, who will act like prosecuting attorneys, until McConnell provides more information about his plans for the trial.
When former President Bill Clinton was impeached, his 1999 State of the Union likewise coincided with his Senate trial. He did not mention impeachment in his address, a show of restraint Trump may not be able to replicate.