The central bank's sweeping actions suggest a cash shortage gripping sectors directly hit by the pandemic. Banks were supposed to be protected by Dodd-Frank but are still vulnerable to a funding domino effect.

The Federal Reserve committed Monday to conducting more asset purchases of Treasury securities and mortgage-backed securities and announced $300 billion in new financing for credit facilities.

Accommodations for borrowers affected by the coronavirus pandemic, such as payment delays and fee waivers, are "positive and proactive actions that can manage or mitigate adverse impacts," the regulators said.

Mark Calabria said Fannie Mae and Freddie Mac are currently equipped to handle elevated delinquencies, but they might need congressional or Federal Reserve help if fallout from the coronavirus persists.

The central bank said it was establishing the Commercial Paper Funding Facility to "support the flow of credit to households and businesses."

The actions include cutting the federal funds rate to between 0% and 0.25% and other steps to ease economic stress from the spread of the coronavirus.

Sen. Mark Warner led a group of Democratic senators in calling on bank, credit union and GSE regulators to give detailed instructions on helping consumer and commercial borrowers hurt by the COVID-19 outbreak.

The agencies recommend steps banks should take to proactively prevent disruption of operations, minimize contact between staff and customers, and plan for how affected employees reenter the workplace, among other things.

Compliance, risk management and staffing will likely come under added scrutiny as regulators lay out a framework for future fintech-bank mergers.

In announcing the central bank’s emergency rate cut, Chairman Jerome Powell warned that the Fed can only do so much.