Breaking with the longstanding norm of intraparty candidate neutrality, a Wyoming Republican Party official asked members of Congress for help vetting potential challengers to U.S. Rep. Liz Cheney in next year’s Republican primary.

According to emails obtained by WyoFile, Wyoming Republican Party Revenue Committee Chairman Jeff Wallack contacted staffers for Rep. Dan Crenshaw (R-Texas) on June 15 “seeking veterans in Congress to vet our retired military candidates Denton Knapp and Bryan Miller.”

Crenshaw, a Cheney ally and former Navy Seal, declined the request.

Wallack made a simila...