U.S. Sen. Mark R. Warner (D-VA), Vice Chairman of the Senate Select Committee on Intelligence and co-founder of the Senate Cybersecurity Caucus, wrote to Office of Management and Budget Director Mick Mulvaney and Secretary of Homeland Security John Kelly, asking what steps the federal government has taken to ensure that federal IT and contractor systems have installed critical security updates to defend against the WannaCry ransomware that has attacked and disabled hundreds of thousands of computers in 150 countries since Friday.