Are you ready to fight for the little agency that fights for us?” the Massachusetts Democrat told a crowd of about 300 CFPB employees and their supporters at a rally Monday outside its now-shuttered headquarters.

Democratic Senator Elizabeth Warren urged President Donald Trump to work with regulators to stop what she called unjustified closing of bank accounts held by citizens and businesses, arguing that efforts to mute the Consumer Financial Protection Bureau will worsen the problem.

A rally outside the Consumer Financial Protection Bureau headquarters in Washington Monday afternoon boasted 17 lawmakers and roughly 600 attendees, organizers said, who were decrying Trump administration efforts to effectively shutter the bureau.

Sen. Elizabeth Warren says there are "zero cops" overseeing the consumer lending market after the CFPB headquarters were shuttered and workers told to stay home.

The Consumer Financial Protection Bureau was established to root out corporate wrongdoing after the 2008 crash. The Trump administration has moved to weaken it.