Rep. Harriet Hageman (R-WY) announced on Tuesday that she would seek the U.S. Senate seat currently held by Sen. Cynthia Lummis (R-WY). Lummis announced last week that she would not seek re-election in the 2026 midterms. Republican Senator Announces Retirement "Our Faith, Our Family, Our Community, and Our Country. That's what we care about, that's what we FIGHT for," Hageman wrote on X. “I stood with President Trump to deliver the largest tax cut in American history, helping working families keep more of their own money,” Hageman said in her campaign announcement video. “We worked together to secure the border and fund efforts to remove and deport those in the country illegally," she added. Check it out: Our Faith, Our Family, Our Community, and Our Country. That's what we care about, that's what we FIGHT for. pic.twitter.com/ii88iYNz1y — Harriet Hageman (@HagemanforWY) December 23, 2025 NBC News has more: Hageman had been eyeing a run for governor, but ultimately decided to run for Senate, noting in an interview with Cowboy State Daily published Tuesday that “it’s important that we have someone who can hit the ground running the moment [Lummis] retires. That’s not the place for on-the-job training.” Hageman added that Trump is “well aware” that she is running for Senate, and she would welcome his endorsement. It's not yet clear if Hageman will face a tough fight for the GOP nomination, especially with Trump's endorsement. There are multiple opportunities for other Wyoming Republicans to run statewide, given the open governor's race and Hageman's campaign opening up her at-large House seat. The winner of the GOP primary would be in a strong position to win the Senate seat in the deep-red state. Trump won Wyoming by nearly 46 percentage points last year. Hageman won her second term in 2024 by 48 points. Trump quickly endorsed Hageman after she made her announcement. "Highly Respected Congresswoman, Harriet Hageman, is running for the United States Senate in the Great State of Wyoming, a place I love and WON BIG in 2016, 2020, and 2024!" Trump wrote on Truth Social. "I know Harriet well, and she is a TOTAL WINNER! Harriet has ALWAYS delivered for Wyoming, and will continue to do so in the United States Senate. She will fight tirelessly to Grow our Economy, Cut Taxes and Regulations, Promote MADE IN THE U.S.A., Advance American Energy DOMINANCE, Champion our Amazing Farmers and Ranchers, Keep our Border SECURE, Stop Migrant Crime, Support our Incredible Military/Veterans, and Defend our always under siege Second Amendment," he continued. "Harriet Hageman has my Complete and Total Endorsement to be your next Senator — SHE WILL NEVER LET YOU DOWN!" he added. Just in: President Trump has officially endorsed Harriet Hageman (@HagemanforWY) for the 2026 Wyoming Senate Race pic.twitter.com/oMlic2RsZK — The Calvin Coolidge Project (@TheCalvinCooli1) December 23, 2025 What do you think? Fox News shared further: Hageman, a water and property rights attorney, grabbed national attention in 2022 when, with Trump's support, she ousted then-Rep. Liz Cheney in the Republican primary for the state's at-large congressional seat. Cheney had become a top Trump target after being just one of 10 House Republicans who voted to impeach the president after the Jan. 6, 2021 attack on the U.S. Capitol. Cheney went on to serve in a leadership role in the Democratic-steered committee that investigated the storming of the Capitol by Trump supporters aiming to upend congressional certification of former President Joe Biden's 2020 White House victory. Hageman, who won nearly 70% of the vote in the general election, was also backed by Trump in her landslide 2022 congressional re-election victory, and a possible endorsement of Hageman by the president as she now bids for the Senate would hardly be surprising. Lummis, in explaining her decision not to seek re-election, pointed to this autumn's divisive government shutdown. "Deciding not to run for re-election does represent a change of heart for me, but in the difficult, exhausting session weeks this fall I’ve come to accept that I do not have six more years in me," the senator wrote in her statement.