1. House Speaker Nancy Pelosi postponed an official trip to Europe and Afghanistan over security concerns after President Trump grounded her military flight and White House officials leaked a secret plan for her to fly commercially.

It was the latest turn in a bitter tit-for-tat between the president and Ms. Pelosi, who asked Mr. Trump on Wednesday to postpone his State of the Union address.

Late in the day Friday, Mr. Trump tweeted he would be making a “major announcement” about the southern border and government shutdown at 3 p.m. on Saturday from the White House.