The legislation outlined by Sanders Monday, which Democrats are calling College for All, would make public colleges and universities tuition-free to students with family income up to $125,000; make community colleges tuition-free; cut student loan interest rates in half; and triple funding for the Federal Work-Study program.

"Our job is not just to resist all of Trump's dumb proposals," Sanders told a group of vocal supporters at the Dirksen Senate office building. "Our job is to bring forward a progressive agenda."

He was joined at the event, which often took on the feel of a political rally, by Massachusetts Senator Elizabeth Warren and Connecticut Senator Richard Blumenthal. House sponsors of the legislation -- Washington Representative Pramila Jayapal and Minnesota Representatives Rick Nolan and Keith Ellison -- were also in attendance. California Senator Kamala Harris, whose state has become a hotbed of free-college proposals, has also said she'll support the bill. And the proposal was lauded by members of National Nurses United and the United States Student Association.