The U.S. government believes hackers from Russia or elsewhere may try to undermine next week's presidential election and is mounting an unprecedented effort to counter their cyber meddling, American officials told NBC News. The effort is being coordinated by the White House and the Department of Homeland Security, but reaches across the government to include the CIA, the National Security Agency and other elements of the Defense Department, current and former officials say. However, a Department of Homeland Security official said, other possible hacks pose "the potential for causing confusion and misperception" around the election. For example, "Somebody could tamper with voter registration information or unofficial election night reporting."