Massachusetts Sen. Elizabeth Warren went off on Donald Trump in nearly a dozen tweets on Monday, shortly after the Republican presidential nominee outlined his economic platform during a speech in Detroit.

Trump's agenda on jobs, taxes and trade "was written by rich corporate insider advisors to make the economy even greater for rich corporate insiders," Warren claimed.

Warren, who is one of the most prominent liberal members of Congress, was met with incessant criticism from Trump when she endorsed Hillary Clinton in June. Trump has repeatedly called her "Pocahontas" and accused her of selling out by supporting his Democratic opponent, who maintains a cozy relationship with Warren's No. 1 enemy: Wall Street.

Seeking revenge, Warren slammed Trump in 10 strongly worded tweets after he promised to slash taxes and challenge federal agencies over their regulations as president.

"Cheating customers & gaming the system might be your business," she tweeted, "but it's not the way America is going to do business."

Trump's promise in his speech at the Detroit Economic Club to work with House Republicans to consolidate existing federal income tax brackets was also met with scorn from Warren.

The candidate had proposed reducing the seven current income tax brackets down to three — 12, 25 and 33 percent — which marked a change from his previous tax reform proposal. Warren claimed the refined income tax rates are "all about helping rich like Donald Trump get richer [and] leaving everyone else behind."

"The American people aren't dumb," she wrote in her final tweet. "We don't trust you with our nuclear codes and we don't trust you with our economy."