Trump Rallies Full of 'older White Men' Suggests Republicans Are a 'dying Party,' GOP Senator Says

The lack of diversity on show at rallies for President Donald Trump and other Republicans show "the spasms of a dying party," according to GOP Senator Jeff Flake.

Related: Donald Trump's Approval Rating At Christmas Makes Him the Least Popular President Ever

The Arizona Senator, a frequent critic of Trump, has announced that he will not seek reelection in 2018. He suggested Sunday that his party cannot rely on the agenda of the current president if it is to succeed across an increasingly diverse country, suggesting it could cost it control of the Senate in 2018.

"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 told 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.

"Sooner or later the voters will figure out, and I think they are and have, that we've got to have something else."

The message stood in stark contrast to that coming from Donald Trump on Christmas Eve. Vacationing at his Florida golf resort of Mar-a-Lago, Trump claimed that his base was far larger than had been portrayed.

"The Fake News refuses to talk about how Big and how Strong our BASE is," he tweeted. "They show Fake Polls just like they report Fake News. Despite only negative reporting, we are doing well - nobody is going to beat us. MAKE AMERICA GREAT AGAIN!"

Trump has recorded the lowest approval rating in polling history for a president at the end of their first year in office. As his rating has shrunk to less than 40 percent, he has seemingly put an increasing focus on energizing his base rather than appealing to larger swathes of the population.

Earlier this month, Trump joined with his former chief strategist Steve Bannon, who once called the publication he ran Breitbart News as "the platform for the alt-right," to support Alabama Senate candidate Roy Moore. After a series of allegations that he preyed on teenage girls when in his 30s, Moore was defeated by Democrat Doug Jones.

Moore, said Flake, would be a "lasting" stain on the Republican Party. But, he added, that he hoped it would lead to Bannon, who is backing a string of anti-establishment candidates in Republican primaries next year, losing any remaining influence.

"I hope [his role is] being marginalized," Flake said. "The last thing we need is to push that ultra-nationalist, ethno-nationalist, protectionist kind of element of the party. That's not good for us."