Rep. Liz Cheney, the Wyoming Republican fighting for political survival after clashing with former president Donald Trump, has started sending Democrats instructions on how to switch parties and vote for her, underscoring an urgent effort to try to overcome serious vulnerabilities ahead of an August primary.

A spokesman for the Wyoming Democratic Party confirmed Thursday that members of the party are receiving the mailers, including the state party’s chairman. “How do I change my party affiliation to register as a Republican so I can vote for Liz?” the mailer reads. Cheney’s website has also been updated to include instructions for Democrats.

The congresswoman has held Wyoming’s at-large district for five years and is facing a handful of Republicans, including Trump-endorsed Harriet Hageman, who used to support Cheney but has embraced the former president’s agenda. Trump’s picks in other primaries this year have suffered some notable defeats, but Cheney must overcome particular ire from Trump and his base as one of his most strident GOP critics. And many local activists in the state have turned sharply against the congresswoman.

Under Wyoming law, voters can change their party affiliation no later than 14 days before the primary — or do so either at their polling place on primary day, or when they request an absentee ballot. The law offers Cheney a chance to appeal to a broader universe of voters, including some who might be disinclined to see a Trump-backed candidate take over her seat in a state where Democrats stand little chance in the general election, due the Wyoming’s strong conservative tilt.