Former House Speaker Newt Gingrich leads the race to become Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s running mate, according to a new report.

Gov. Chris Christie ranks a close second on the billionaire’s vice presidential shortlist, The Washington Post reported Thursday, corroborating several other reports this week that the New Jersey governor is in the running.

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Sources told the Post that Trump’s campaign has asked both men to submit documents for its vetting process and answer more than 100 questions from attorney Arthur B. Culvahouse Jr.

Culvahouse, who vetted Sarah Palin for John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE in his 2008 presidential run, has also requested the top contenders submit extensive personal and professional files, including tax records and any published articles and books.

Christie and Gingrich top a list of more than six remaining candidates less than three weeks before the Republican National Convention. Trump has previously said he will announce his choice at the convention, but the Post reported that his campaign is considering revealing his running mate as early as next week.

Gingrich’s stock is particularly high, as he has the support of key Trump confidantes like former GOP presidential candidate Ben Carson.

Lower down on Trump’s shortlist are Sens. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (Ala.) and Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (Tenn.).

Longer-shot options include Sens. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (N.C.), Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (Ark.), John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.) and Joni Ernst (Iowa), and Govs. Mike Pence (Ind.) and Mary Fallin (Okla.).

Gingrich and Christie have been active supporters of the presumptive GOP nominee, and the Post said Trump admires the pair for their experience battling and compromising with Democrats.

Robert Jeffress, a Dallas pastor who has become close with Trump during his campaign, said Thursday the businessman understands the value of legislative experience.

“He’d be coming in as an outsider and that has fueled his popularity,” he said. “But he is the first to admit that he doesn’t know all the ways of Washington. So to actually push what he wants through, he’s willing to reach out and get somebody to lend a hand."

Both Gingrich and Christie are former Republican presidential candidates, with the former running in 2012 and the latter in 2016.