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Paul's campaign then details a series of Trump donations to prominent Democrats, including Sen. John KerryJohn Forbes KerryOcasio-Cortez and Cruz's dialogue shows common ground isn't just for moderates 'Landslide' for Biden? A look at 40 years of inaccurate presidential polls Trump campaign considering making a play for blue state Oregon: report MORE (Mass.), Sen. Charles SchumerCharles (Chuck) Ellis SchumerElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw US women's soccer team reignites equal pay push MORE (N.Y.) and Rep. Charles Rangel (N.Y.). 

The Romney campaign confirmed to The Hill earlier Thursday that Trump is expected to endorse the former governor at a rally in Las Vegas. The reality show star was at one time flirting with entering the GOP race on his own, but ultimately decided to return to hosting "The Apprentice."

The Gingrich campaign has not commented on the endorsement. Reports from Nevada Wednesday night had the former Speaker's staff expecting Trump to endorse him, only to have reports that Romney was the choice trickle out Thursday morning.

Democratic National Committee Chairwoman Debbie Wasserman Schultz (Fla.) called the endorsement "a non-news event" and mocked both for making millions "firing people" during an interview Thursday morning.

"It really wouldn't be surprising if Donald TrumpDonald John TrumpTrump cites tax cuts over judges as having biggest impact of his presidency Trump cites tax cuts over judges as having biggest impact of his presidency Ocasio-Cortez claps back at Trump after he cites her in tweet rejecting impeachment MORE supports Mitt Romney, because they both like firing people and they've both made millions doing it," Wasserman Schultz said on MSNBC. "Donald Trump is such a cartoon character, an endorsement no matter who he chooses is like Bugs Bunny making an endorsement."