1. President Trump called for an investigation into financial ties between China and the family of former Vice President Joe Biden, the Democratic front-runner in the 2020 race.

The Bidens have denied accusations raised by a conservative author, Peter Schweizer, that Mr. Biden’s younger son, Hunter, made millions from the Chinese government as his father was negotiating with Chinese officials over government issues. It may come up at Mr. Trump’s rally this evening in Pennsylvania, pictured above.

Mr. Trump has threatened investigations of Hillary Clinton and James Comey in the past. When Donald McGahn served as White House counsel, he cautioned the president that asking law enforcement to investigate rivals would be an abuse of power and could expose him to charges of impeachment.