Former President Trump and those close to him have been attempting to persuade lawmakers in Wyoming to change the state’s election laws as part of his ongoing effort to unseat GOP Rep. Liz Cheney.

This week, Trump publicly endorsed legislation that would prevent Democrats, Republicans and independents from switching party affiliations on the day of the state’s primary to vote for a candidate in a different party.

State Sen. Bo Biteman introduced the legislation as part of an effort to prevent non-Republicans from voting for Cheney on primary election day, which this year is August 16.