Top Donald TrumpDonald John TrumpBiden says his faith is 'bedrock foundation of my life' after Trump claim Coronavirus talks on life support as parties dig in, pass blame Ohio governor tests negative in second coronavirus test MORE aide Corey Lewandowski said Sunday the presumptive Republican presidential nominee's campaign is closing in on a running mate.

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"I can say that the list is very small, and we have a very good understanding of who those individuals will be and the decision will be made by Mr. Trump," Lewandowski said on "Fox News Sunday."

Lewandowski is in charge of the team that will vet potential vice presidential candidates.

Several prominent Republican names have been floated, including New Jersey Gov. Chris Christie, former Speaker Newt Gingrich, Rep. Marsha BlackburnMarsha BlackburnTennessee primary battle turns nasty for Republicans GOP may face choice on tax cut or stimulus checks Koch-backed group urges Senate to oppose 'bailouts' of states in new ads MORE (Tenn.) and South Carolina Gov. Nikki Haley.

Trump said earlier this month he would stick with tradition and name his running mate at the Republican National Convention in July.