If Donald Trump wants to be the next president of the United States, he has one choice and one choice only for his running mate, according to Bill O'Reilly: New Mexico Gov. Susana Martinez.

"There's only one choice for vice president if Donald Trump wants to win the White House. Only one person. Do you know who that is?" the Fox News host asked former White House press secretary and current colleague Dana Perino during a segment on his Thursday night show.

O'Reilly dropped the name: "Governor Susana Martinez of New Mexico."

"That is the only choice if Mr. Trump, with all due respect, wants to be president, he must give it to the governor of New Mexico," O'Reilly said, adding that the chair of the Republican Governors Association "cuts across all ethnic boundaries that he's weak in, she's very bright, she is a Republican conservative in a state that would go, you know, it's not a lot of electoral votes, but if he can convince Gov. Martinez to be on the second, that will help him immensely."

Perino, who had suggested a "conservative Westerner of some sort," did not seem sold.

"It's not a bad one," she said. "I don't know if it's a good fit."