With Rep. Marjorie Taylor Greene (R-GA) planning to resign from Congress after years as a loyal MAGA footsoldier, her farewell statement laden with disillusionment against Trump's movement is a flashing danger sign for the president that his whole base could fracture, former GOP speechwriter Tim Miller told MSN NOW's Nicolle Wallace on Monday.

"Your thoughts on this moment for Donald Trump and Marjorie Taylor Greene?" asked Wallace.

"Look, you laid out nicely in the beginning how this is similar to how some have, you know, the Republican Party have spoken out against Trump and then retired in the past," said Miller. "And we're seeing that trend continue, which at some level shows that he still has a hold over the party. I think the element that's different that is most interesting is the language that she used in stepping aside."

"I'll leave it to ... psychologists to, like, determine what is happening in her brain and how serious she is about this and what's exactly motivating it," Miller continued. "But it's just — taking the language at face value, she is basically saying that I wanted to do work on behalf of the MAGA base that Donald Trump had promised, you know, he was going to work for, and I couldn't do it because Congress was in session and because the elites within the party, you know, have succumbed to, you know, the influence game of Washington to the Deep State, to the elites, right?"

"Like, that's essentially her argument, her argument that, you know, you always heard from the populist, from the MAGA populists," he said. "One common critique was that there was this 'uniparty' in Washington. Democrats and Republicans might disagree on certain issues, but at the end, they were on the side of the rich. They were on the side of the, you know, military and the security state. And they were on the side of corporations. They weren't on the side of you. Well, now, Marjorie Taylor Greene is saying that's Donald Trump. You know, he had promised you that he was going to be different. He's going to be an outsider that was going to go after those institutions. But he's been co-opted by them. And he wants and he likes partying with them."

She didn't explicitly say Trump in her farewell manifesto, Miller noted — "but, like, in the statement, that's very clear what she's talking about. And that is powerful. And that is very different from the other people that have separated from Donald Trump in the past, because she's coming at him from the place of his core base of support and his core strength. And if even 5 percent of the MAGA base agree with her ... that is crippling to Donald Trump's power. That is the first time that he would actually lose the people that powered his rise."

"And so in that sense, I think it was a powerful resignation statement," he added, and "the interesting thing to watch will be if other people start to echo that message."

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