Michigan Gov. Gretchen Whitmer may have been a late endorser of Joe Biden’s presidential bid, but she has emerged as a top candidate for his running mate.

The former vice president on Tuesday told MSNBC host Brian Williams that the Michigan governor is one of his top choices, even as he has yet to wrap up the Democratic nomination against Vermont Sen. Bernie Sanders. Whitmer, 48, “made [the vice-presidential list] in my mind two months ago,” said Biden, 77.