Sen. Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) is expected to join a rally outside of the Consumer Financial Protection Bureau (CFPB) headquarters Tuesday to protest President Trump's appointment of budget chief Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE to lead the Wall Street watchdog agency.

The Democratic senator will join the Progressive Campaign Change Committee's lunchtime demonstration to demand that "unfit Mick Mulvaney step aside and let acting CFPB director Leandra English do her job," according to an advisory of the event.

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Warren and Adam Green, the group's co-founder, are expected to speak at the event, in which rallygoers are expected to carry signs that read, “Trump & Mulvaney: Breaking the Law to Help Wall Street.”

"President Trump is breaking the law by trying to install Mick Mulvaney as the director of the agency, without Congressional approval," the advisory states.

The Massachusetts lawmaker, a key architect of the agency, tore into Trump over the weekend in a series of tweets that accused the president of trying to destroy the consumer watchdog agency.