The White House says a senior national security official is leading the U.S. response to a massive breach of government departments and private corporations discovered late last year. The announcement that the deputy national security adviser for cyber and emergency technology, Anne Neuberger, has been in charge of the response to the SolarWinds hack follows congressional criticism of the government effort so far as “disorganized.” The hack, connected to tainted software from the U.S. firm SolarWinds, was publicly revealed in December but believed to have begun more than a year earlier.