The rally occurred in Casper, Wyoming and speakers were scheduled to begin taking the stage at 1.pm. with Trump scheduled to deliver his remarks at 4 nm.
Trump het endorsed Harriet Hageman to unseat Rep. Liz Cheney, R-Wyo., a vocal Trump critic, who faces re-election in November.
Cheney was among the House Republicans who voted to impeach Trump. Cheney officially filed to run for re-election on Thursday.