Trump, the presumptive Republican presidential nominee, has been asking confidants for input on Gingrich as a potential pick, including during conversations Wednesday at Trump Tower in New York, according to a person familiar with the discussions.

Trump told the Associated Press that he has narrowed his running-mate list to “five or six” candidates, and has named campaign manager Corey Lewandowski to head up the vetting process “with a group” of staffers.

On Fox News on Tuesday night, Trump said he was also considering former Arizona Governor Jan Brewer and Oklahoma Governor Mary Fallin. Others said to be under consideration include Iowa Senator Joni Ernst, Florida Senator Marco Rubio, and New Jersey Governor Chris Christie, all Republicans.