U.S. Senator Marco Rubio, an ally of Republican presidential candidate Donald Trump, will not accept the results of the Nov. 5 election if they are “unfair,” he said on Sunday.

“Will you accept the election results of 2024, no matter what happens, senator?” NBC News’ “Meet the Press” host Kristen Welker asked Rubio, a Florida Republican, in an interview.

“No matter what happens? No,” Rubio answered. “If it’s an unfair election, I think it’s going to be contested by either side.”

Trump and his allies are laying the groundwork to contest a potential loss in November, stoking doubts about the election’s legitimacy even as polls show the former president leading in battleground states, Reuters reported on Thursday.