Top Donald TrumpDonald John TrumpArizona GOP Senate candidate defends bus tour with far-right activist Alyssa Milano protests Kavanaugh in 'Handmaid's Tale' costume Bomb in deadly Yemen school bus attack was manufactured by US firm: report 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 BlackburnElection Countdown: Takeaways from too-close-to-call Ohio special election | Trump endorsements cement power but come with risks | GOP leader's race now rated as 'toss-up' | Record numbers of women nominated | Latino candidates get prominent role in 2020 Top Koch official fires back at critics: We are not an 'appendage' of theĀ GOP The Hill's Morning Report: Trump tries to rescue Ohio House seat as GOP midterm fears grow 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.