WASHINGTON (Reuters) - Treasury Secretary Steven Mnuchin and Fed Chair Jerome Powell said U.S. small businesses remain at risk amid a surging pandemic, with Mnuchin suggesting $300 billion be set aside for grants to struggling businesses. “These businesses cannot wait two or three months,” Mnuchin told the Senate Banking Committee, urging lawmakers to repurpose funds he is clawing back from other Fed programs. “There are a lot of small businesses that are at risk,” Powell said. Reporting by Howard Schneider; Editing by Chizu Nomiyama Our Standards: The Thomson Reuters Trust Principles.