The White House has said President Donald Trump continues to back Howard Lutnick, as the Commerce Secretary faces criticism from Capitol Hill after reports that he delayed action to curb chip smuggling. There were also concerns about whether the government was properly overseeing Nvidia chip exports to China. "Secretary Howard Lutnick and undersecretary Jeffrey Kessler must explain why they have not closed export control loopholes and act today to ensure our advanced technology is not fuelling China's military," said Democratic Senator Elizabeth Warren, who is set to become chairwoman of the banking committee.