Wyoming Rep. Liz Cheney, the most ardent Republican critic of former President Donald Trump in Congress, will lose her primary to Trump-backed attorney Harriet Hageman, CNN projects.Cheney, the last of the 10 House Republicans who voted for Trump's second impeachment to face voters, now becomes the eighth who will not be returning to Congress next year.Despite her conservative credentials and party pedigree, her role as Trump's chief GOP critic on Capitol Hill made her a heavy underdog in a state the former President won with nearly 70% of the vote in 2020. His enduring popularity there, coupled with Cheney's role as vice chair of the House select committee investigating the January 6, 2021, attack on the US Capitol, made the three-term congresswoman and daughter of former Vice President Dick Cheney a top target of Trump allies.Trump's grip on the GOP has been proven again and again since he left Washington. But Cheney's loss, though widely anticipated, represents a significant marker in the wider fight over the direction of the Republican Party. Once considered an up-and-comer in the party, she was booted from House GOP leadership last year over her unyielding opposition to the former President and trailed in polling back home this year.With Wyoming's vote in, Cheney becomes the fourth House Republican who voted to impeach Trump to lose her primary. Four others were not running for another term. The two survivors to date, in California and Washington, benefited from their states' nonpartisan primary system. Cheney had no such cushion, though a late push for Democrats and independents to register for the GOP primary might have somewhat softened the ultimate count.