Rep. Liz Cheney, R-Wyo., announced Thursday that she will not be running for her state's open Senate seat in 2020 and will instead seek reelection to the House, after speculation that she was preparing a bid for the upper chamber.

“Nancy Pelosi and the Socialist Democrats in the House of Representatives are threatening our freedom and our Wyoming values every day. They must be stopped,” she said in a statement, accusing House Democrats of working “to weaken our president and embolden our enemies.”

LIZ CHENEY CALLS NANCY PELOSI AN 'EMBARRASSMENT' AFTER SPEAKER SPOTTED AT PARTY FOLLOWING MISSILE FIRE ON US TROOPS

"I believe I can have the biggest impact for the people of Wyoming by remaining in leadership in the House of Representatives and working to take our Republican majority back. I will not be running for the Senate in 2020,” she said. “I plan to seek re-election to the House of Representatives.”

Cheney's decision was first reported by the Casper Star-Tribune. Cheney was expected to face an uphill climb to get the GOP nod for the Senate against former Rep. Cynthia Lummis, R-Wyo. It means she now has a very good shot to move up in the House GOP leadership.

Cheney, a former senior State Department official and the daughter of former Vice President Dick Cheney, is one of just 13 women in the GOP conference and is currently number three in the GOP hierarchy in her role as the chairwoman of the House Republican Conference.

Cheney launched a bid to replace Sen. Mike Enzi in 2014, but eventually abandoned it citing health issues in her family. Her decision to stay in the House could also set up a potential leadership fight with second-ranking leader Rep. Steve Scalise, R-La.

CLICK HERE TO GET THE FOX NEWS APP

Her announcement Thursday drew immediate support from fellow Wyoming lawmakers. Sen. John Barrasso said that they were “fortunate” to have Cheney serving in the House.

“Liz Cheney’s strong leadership and commitment to advancing Wyoming values are vitally important in our efforts to bring fundamental change to the House of Representatives,” Barrasso said.

Fox News' Chad Pergram and The Associated Press contributed to this report.