Newt Gingrich said Thursday evening that he'd be "compelled to serve the country" if GOP presidential candidate Donald TrumpDonald TrumpUS gives examples of possible sanctions relief to Iran GOP lawmaker demands review over FBI saying baseball shooting was 'suicide by cop' House passes bill aimed at stopping future Trump travel ban MORE asked him to be his running mate.
 
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"If Trump offers the position and is serious about it, which I think he would be after our conversations, [my wife] Callista and I would feel compelled to serve the country," the former Speaker said on Fox News's "On the Record."
 
"I think that we are at a crossroads in American history, frankly captured in part by what happened over the last few days," he added. "We're either going to clean up Washington or Washington is going to corrupt the whole country."
 
Gingrich praised the businessman as a "remarkable figure" and a "historic" presidential candidate.
 
The Georgia Republican said "five or six people are being vetted" for VP, indicating he was among them. He also said Trump will likely make a final decision next week and announce it "Thursday or Friday so they dominate the weekend news going into the convention."
 
Speculation over who Trump and Hillary ClintonHillary Diane Rodham ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' MORE, the presumptive Democratic nominee, will pick as their running mates is heating up ahead of the GOP and Democratic conventions later this month.
 
Gingrich spoke at Trump's rally Wednesday night in Cincinnati and is among several potential VP picks appearing with the candidate at events this week, though some — most notably Sen. Bob CorkerRobert (Bob) Phillips CorkerFox News inks contributor deal with former Democratic House member Senate GOP faces retirement brain drain Roy Blunt won't run for Senate seat in 2022 MORE (Tenn.) — have said they're not interested in the job.
  
Trump, who this week said Gingrich would be involved in his administration "in one form or another," is slated to campaign Friday with New Jersey Gov. Chris Christie in Miami.
 
"I think it'd be very, very hard for Callista and me not to find a way to serve the country," Gingrich said Thursday.