High-priority alert based on source significance and keyword relevance.
Context
What happened: Trump criticized Rep. Henry Cuellar, D-Texas, calling him a "loser" for staying a Democrat after Trump pardoned him and his wife last year. Trump backed Cuellar's opponent, Tano Tijerina.
Why it matters: Trump framed the pardon as expecting party loyalty and endorsed Tijerina, who said Trump confirmed his claim about Cuellar. Cuellar is seeking re-election.
Key numbers: Cuellar has served in the House since 2005.