US security officials say attackers based in Iran scanned state websites for vulnerabilities, successfully breaching at least one, in intimidation campaign aimed at thousands

Trump says move aims to prevent leaks; Democrats accuse him of trying to cover up Russian help for his reelection campaign

Announcement leaves intel community without a permanent, Senate-confirmed leader, with an array of foreign threats looming on the horizon

John Ratcliffe comes to job with resume long on vociferous support for president, but not much in way of national security, critics say