Former House Speaker Newt Gingrich, a possible vice presidential candidate, said Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE will announce his running mate later this week.

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"I think they'll let everybody know probably Thursday or Friday," Gingrich said during a Monday night interview with Fox News’s Greta Van Susteren, which was first reported by The Washington Examiner.

The Washington Post also said a decision is likely at the end of this week and said Monday night that Trump favors a trio of elected leaders on his list: Indiana Gov. Mike Pence, New Jersey Gov. Chris Christie and Gingrich.

Gingrich has often been mentioned as a front-runner on Trump’s vice presidential shortlist, and though he’s expressed interest in the role, the Georgia Republican remained mum Monday night on whether he'd accept.

"Callista and I have a lot of things going on right now. We each have a book coming out. We just released a movie on George Washington called 'First American.' We have an exciting new project on women of the American Revolution, so we'd want to stop and talk through exactly what he'd have in mind and whether or not at a practical level we can make the transition," Gingrich said.

Bloomberg reported Monday evening that Trump is eyeing Gingrich for a top national security role in his potential administration.

While campaigning together last week in Ohio, the presumptive GOP nominee didn't elaborate on the kind of role Gingrich would play in a possible Trump administration but did say he would be involved.

"Newt has been my friend for a long time. And I'm not saying anything, and I'm not telling even Newt anything, but I can tell you, in one form or another, Newt Gingrich is going to be involved with our government," Trump said. "That I can tell you."

There are a handful of others being considered, including Pence.

The Washington Times reported Sunday night that there’s a “95 percent probability” of Pence being selected, and Trump’s scheduled stop in the Hoosier State on Tuesday is stoking further speculation.

New Jersey Gov. Chris Christie, who was the first of Trump’s GOP rivals to endorse him, is also being considered as a vice presidential candidate, as well as retired Lt. Gen. Michael T. Flynn.