Cara Petersen, the performing head of enforcement for the Client Monetary Safety Bureau, give up on Tuesday after sending a fiery e-mail to her division denouncing the Trump administration’s efforts to intestine the watchdog company.

“I’ve served underneath each director and performing director within the bureau’s historical past and by no means earlier than have I seen the flexibility to carry out our core mission so underneath assault,” wrote Ms. Petersen, who had labored on the company since its creation in 2011.

The buyer bureau, the one federal regulator and enforcer of client monetary safety legal guidelines, has been preventing for its survival since President Trump put in Russell T. Vought, the White Home finances workplace director, because the company’s performing chief in early February. Congress created the bureau, and solely Congress can shut it, however Mr. Vought has halted almost all of its work and sought to fireplace 90 p.c of its workers. Court docket orders have quickly paused the firings, however a lot of the company’s workers is on administrative go away.

Ms. Petersen grew to become the company’s performing head of enforcement after the earlier enforcement chief, Eric Halperin, resigned in February along with his personal scathing e-mail. Since then, Mr. Vought has deserted and dismissed many of the bureau’s enforcement instances, together with main lawsuits towards giant banks over fraud on their funds apps and misleading techniques that disadvantaged clients of upper rates of interest on their financial savings accounts.

He additionally terminated a number of settlement offers, permitting firms to maintain cash they’d agreed to pay in penalties and buyer refunds. Final month the company terminated an order that required Toyota to refund $48 million to clients the carmaker had prevented from canceling undesirable insurance coverage merchandise.

“It’s clear that the bureau’s present management has no intention to implement the regulation in any significant method,” Ms. Petersen wrote in her farewell e-mail. “Whereas I want you all the very best, I fear for American shoppers.”