Article snippet: President Trump this morning lashed out at reports that he is being investigated for firing former FBI Director James Comey last month. "I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt," Trump wrote in a tweet. ABC News has reached out to the White House for comment. A source close to the president's legal team said that the tweet was not actually confirming an investigation, but rather referencing a Washington Post story Wednesday that reported Special Counsel Robert Mueller had expanded his probe of Russian election meddling to include whether Trump obstructed justice. Officials who served on Trump's transition team have been instructed to preserve all documents that could be pertinent to the Russia investigations conducted by Congress and the special counsel. In May, Deputy Attorney General Rod Rosenstein appointed former FBI director Robert Mueller as special counsel to take over the FBI’s investigation into Russia’s meddling in the election. Trump has repeatedly denied that he is under investigation. “No collusion, no obstruction,” he remarked at a news conference last Friday. The Washington Post reported that the obstruction of justice inquiry stems from Trump's firing of Comey, who was overseeing the FBI probe. ABC News has not been able to independently confirm the report. After the report, Trump tweeted Thursday, "They made up a phony collusion with the Russia... Link to the full article to read more