Retiring Sen. Jeff Flake (R-Ariz.) on Sunday said the crowds at rallies for President Trump and other Republicans reflect “spasms of a dying party,” adding that the GOP will have to formulate a governing agenda to reach more voters.

“When you look at some of the audiences cheering for Republicans, sometimes, you look out there and you say, ‘those are the spasms of a dying party,’ ” Flake said on ABC’s “This Week.”

“When you look at the lack of diversity, sometimes, and it depends on where you are, obviously, but by and large, we’re appealing to older white men and there are just a limited number of them, and anger and resentment are not a governing philosophy,” he continued.

Flake, who has announced he will not seek reelection in 2018, has been a frequent critic of Trump, earning the president’s ire on Twitter.