The AP is reporting the endorsement will take place later today.
"He's got great ideas. He's very smart, he's very tough and he is a great debater," Trump said of Gingrich, who hasn't confirmed the report, on Sunday.
It's appropriate for the Donald to make his endorsement in Las Vegas, where he owns a 64-story hotel, and where the Nevada caucuses take place Saturday.
Donald Trump - Newt Gingrich
It also makes sense for him to endorse Gingrich for the GOP nomination in general, as Newt seems to best embody Trump's pugnacious political style.
It's unclear if Trump's endorsement will do much for Gingrich in Nevada ... or at all.
Gingrich was creamed by Mitt Romney in Florida's primary this Tuesday, and trails big in Nevada as well, though he vows to stay in the Republican race.
Trump's waning influence was on display in December, when he attempted to host a GOP debate, only to be rebuffed by everyone but Rick Santorum and Gingrich.
Still, a high-profile Republican stepping up for Newt in the wake of his recent setback shows that not everyone in the party is ready to coalesce around Mitt.
UPDATE: Or maybe not. Surces close to the Romney campaign claim that the real estate mogul will back the former Massachusetts governor instead!
Stay tuned ...