Republican National Committee Chairman Michael Whatley has launched his campaign for North Carolina's open U.S. Senate seat.

Whatley made his formal announcement on Thursday. He already has President Donald Trump's endorsement and access to a strong fundraising network. Whatley could face Democratic former Gov. Roy Cooper in what's expected to be one of the most competitive and expensive 2026 contests.

The winner will succeed GOP Sen. Thom Tillis, who recently announced he would not run for a third term. Whatley has led the state Republican Party and was elected Republican National Committee chairman last year.

Cooper announced his candidacy earlier this week. National Republican strategists say Cooper’s entry makes North Carolina a more challenging seat for the party to hold.