Trump 'unlikely' to pick Christie for VP: report
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New Jersey Gov. Chris Christie is unlikely to be Donald TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE's running mate, two sources told nj.com. 

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Christie, who endorsed Trump after ending his own presidential campaign earlier this year, has become an adviser to the campaign and a rumored vice presidential pick.

But sources say the presumptive GOP nominee is more likely to pick former Speaker Newt Gingrich, according to the nj.com report Thursday. 

The pool of those willing to serve as Trump's vice president has dwindled, with both Sens. Bob CorkerRobert (Bob) Phillips CorkerTrump announces, endorses ambassador to Japan's Tennessee Senate bid Meet the key Senate player in GOP fight over Saudi Arabia Trump says he's 'very happy' some GOP senators have 'gone on to greener pastures' MORE of Tennessee and Joni Ernst of Iowa backing out on Wednesday. 

Indiana Gov. Mike PenceMichael (Mike) Richard PenceRepublicans to hand out 'baseball cards' mocking Gary Peters in Michigan Pence taps former DHS spokeswoman as his new press secretary GOP group hits Pence over Trump alleged business conflicts MORE has been floated as a popular pick in recent days, after meeting with Trump last weekend in New Jersey. 

Other possible candidates mentioned over the past several weeks include Alabama Sen. Jeff Sessions, Oklahoma Gov. Mary Fallin, Tennessee Rep. Marsha Blackburn, retired neurosurgeon Ben Carson, former Massachusetts Sen. Scott Brown and Ohio Gov. John Kasich, who ended his own presidential bid in May.

Trump has said he expects to announce his pick before the Republican National Convention in Cleveland, which runs from July 18 to July 22.