A conservative columnist criticized the Republican Party and warned that is has become the "party of old white men."

The GOP “has become the caricature the left always said it was — the party of old white men," Jennifer Rubin, the author of The Washington Post's "Right Turn" blog, said during Politico's "Off Message" podcast.

"And that has become more so in the age of Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, when he is actively courting and stoking white resentment.”

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Rubin said those were her thoughts after she saw a picture last week of Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) and the GOP congressional leadership during a dinner at the White House.

Rubin also warned during the interview that the way Trump uses identity politics is "a dead end for the party."

"It’s a dead end because it’s immoral and anti-American to base an entire political movement on one racial group, and it’s a dead end because that’s not America and [what America] is becoming," she said.

She told Politico that Republicans have "permanently eliminated themselves from credibility to govern."

“You can’t be willing to sacrifice core American values for the sake of a tax cut and be deemed to be worthy of trust going forward," she said.

Rubin has often been a harsh critic of Trump, in the past referring to the president as an "arrogant fool" and a "flat-out racist."

In May 2016, she published a piece addressed to the Republican Party titled "Dear GOP: I'm just not that into you."

During the Politico interview, Rubin also took aim at the president, saying he is "threatening thermonuclear war."

“I have often observed that if you had the Trump administration without Trump, they would be doing a lot of sane things," she said.