U.S. Rep. Lauren Boebert hit the airwaves Monday with a TV ad touting Donald Trump’s backing in the first salvo of the Republican primary election in her new congressional district.

“Lauren, you’re going to do fantastically in your district,” says Trump in the 30-second ad, which features Trump’s recent endorsement calling Boebert a “proven conservative.”

The GOP lawmaker is seeking a return ticket to Congress next year after moving across the state from the Western Colorado seat she represents to the 4th Congressional District, which Republican U.S. Rep. Ken Buck holds. Last week, Buck announced his resignation after earlier announcing he would not seek another term.

“We need Lauren fighting for us in Washington,” the ad’s announcer says. “Stand with President Trump and vote Lauren Boebert for Congress.”

Boebert is one of nearly a dozen Republicans running in the June 25 primary to pick the party’s nominee for the November ballot in the heavily Republican district.

In a simultaneous special election, voters will also decide which candidate fills the remainder of Buck’s term following his resignation, which takes effect Friday. Boebert announced last week that she won’t run in the special election, saying she doesn’t want to create another vacancy by having to resign the seat she currently holds.

A Boebert campaign spokesman said the campaign is spending $60,000 to run the ad on cable channels and streaming services for three weeks in the 4th CD, which covers Douglas County, parts of Larimer and Weld counties and the Eastern Plains.

The ad will air through the GOP’s 4th CD assembly on April 5, when Republican delegates will designate candidates who receive at least 30% support to the primary ballot.

Boebert learned a week ago that she’s already qualified for the primary by petition, so she only needs the votes of at least 10% of assembly delegates to secure her spot.

Additional Republicans running in the crowded primary include state Reps. Mike Lynch and Richard Holtorf, former state Sens. Jerry Sonnenberg, Ted Harvey and former radio talker Deborah Flora.

Unlike Boebert, the other announced primary candidates have said they will seek the GOP nod to run in the special election, which will be decided on March 28 at a special convention in Hugo.

Boebert held a wide fundraising advantage over the other GOP candidates for Buck’s seat heading into the year, finishing the quarter that ended Dec. 31 with $1.3 million cash on hand – roughly 10 times as much as her nearest competitor.

Four Democrats are also running in the special election and the district’s primary: Isaac McCorkle, who lost the 2020 and 2022 elections to Buck; former U.S. Senate hopeful Karen Breslin; and first-time candidates John Padora and Trisha Calvarese.