Former President Donald Trump urged his supporters Friday evening not to be complacent in the face of a commanding polling lead as he kicked off the sprint to the Iowa caucuses with his first events of the election year.

“Ten days from now, the people of this state are going to cast the most important vote of your entire lives,” Trump told several hundred supporters gathered in Sioux Center. He implored them to turn out on caucus night, warning, “Bad things happen when you sit back.”

Trump held a pair of commit–to–caucus events, one in the far northwest corner of the state on the border with South Dakota and one in north–central Mason City. He’ll spend Saturday in Newton in central Iowa before heading to Clinton in the state’s far east.

The visit came the day before the third anniversary of Jan. 6, 2021, when a violent mob of Trump’s supporters stormed the U.S. Capitol as part of a desperate bid to keep him in power after his 2020 election loss. Trump did not acknowledge the date Friday, but railed against the treatment of those who have been jailed for participating in the riot, labeling them “hostages” and saying it will “go down as one of the saddest things in the history of our country.”

More than 1,230 people have been charged with federal crimes for their participation, including felonies like assaulting police officers and seditious conspiracy.

Trump also asked at one point in Sioux Center whether there was anyone in the friendly room who wasn’t planning to vote for him, but then quickly warned them not to raise their hands.

“They’re going to say he incited an insurrection,” he said to laughs.

And over and over, he repeated his false claims that the 2020 election was stolen — the same lies that motivated the rioters.

Trump also spent much of the night lashing out at President Joe Biden, who earlier Friday delivered a speech warning that Trump’s efforts to retake the White House pose a grave threat to the country and democracy.

“We all know who Donald Trump is,” Biden said near Valley Forge, Pennsylvania, where George Washington and the Continental Army spent a bleak winter nearly 250 years ago. “The question we have to answer is: Who are we?”

Biden said Jan. 6 marked a moment where “we nearly lost America — lost it all.”

“He is a danger to democracy,” Trump charged in Mason City.