Republican Rick Saccone is conceding a special congressional election in southwestern Pennsylvania to Democrat Conor Lamb after the GOP considered a recount and legal action.
Lamb led by about 750 votes in a remarkable upset in a Republican-held district President Donald Trump won by 20 percentage points just 16 months ago.
At a Republican fundraising event Tuesday, Trump said Saccone "didn't quite make it."
"It was really close," Trump told the attendees. "We went in there. They were down. Good man, Rick Saccone. Good man. And didn't quite make it. But lost, think of it, lost by about 300 votes out of all of those votes. So, it's pretty incredible. But we can't let it happen. We have to win. There's nothing like winning. We have to win."
The 33-year-old Lamb succeeds Republican Tim Murphy, the eight-term congressman who resigned in October amid a sex scandal. Vote counting was nearly over.
In the race, Lamb struck a moderate tone. He downplayed opposition to Trump, opposed sweeping new gun regulations and supported Trump's steel tariffs, but he's a fierce critic of Republicans' tax cuts and health care policy.
Lamb's victory has sent shivers through Republicans as they try to keep their U.S. House majority in looming midterm elections.