Top Donald TrumpDonald TrumpMyPillow CEO to pull ads from Fox News Haaland, Native American leaders press for Indigenous land protections Simone Biles, Vince Lombardi and the courage to walk away 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 BlackburnBiden officials pledge to confront cybersecurity challenges head-on Biden's misinformation crackdown spotlights partisan divide on content reform White House looks to cool battle with Facebook 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.