Donald Trump has a big speaking engagement Wednesday night — and there’s no telling whether he’ll help or hurt the GOP’s Capitol Hill agenda.

The president is slated to address House Republicans at the NRCC’s annual dinner — the day after Democrats flipped a Florida statehouse seat that includes his home at Mar-a-Lago.

The last time Trump addressed the GOP conference, earlier this month in Florida, he sparked a slew of headaches for his party by insisting on passage of a partisan elections bill that has little chance of becoming law.

This time could be no different. Trump has so far hardly delivered a ringing public endorsement of a potential…

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