President Joe Biden warned Friday that Donald Trump's efforts to retake the White House in 2024 pose a grave threat to the country, the day before the third anniversary of the violent riot at the U.S. Capitol by then-President Trump’s supporters aiming to keep him in power. Speaking near Valley Forge, Pennsylvania, where George Washington and the Continental Army spent a bleak winter nearly 250 years ago, Biden said that Jan. 6 2021, marked a moment where “we nearly lost America — lost it all.”