President Donald Trump lashed out Thursday at the investigators driving the Russian Federation investigation as "very bad and conflicted people", responding angrily to reports that the special counsel is looking into whether Trump obstructed justice.
The Washington Post, citing anonymous sources, had reported some hours earlier that Mueller, who is probing Russia's election interference and the possible links between Moscow and Trump's campaign, had added a key element to that probe, namely that the President would now be under investigation for obstruction of justice.
Mr Trump wrote: "You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!"
Mueller has the authority to investigate whether Trump tried to obstruct justice which is a potentially impeachable offense.
Sen. Richard Burr, R-N.C., right, chairman of the Senate Select Committee on Intelligence, and Vice Chairman Mark Warner, D-Va., left, listen as Attorney General Jeff Sessions testifies before the Senate Select Committee on Intelligence about his role in the firing of FBI Director James Comey and the investigation into contacts between Trump campaign associates and Russian Federation, on Capitol Hill in Washington, Tuesday, June 13, 2017.
Mueller investigation's appeared to be reaching a broadening circle of current and former officials.
Accusations of obstruction arose last month when Trump fired FBI Director James Comey.
Senior US intelligence officials have agreed to be interviewed by investigators working for Robert Mueller, a respected former Federal Bureau of Investigation chief, according to reports in both The Washington Post and New York Times.
"We may have our differences, but we do well in times like these to remember that everyone who serves in our nation's capital is here because above all they love our country", Trump said at the White House.
Comey, who had been overseeing the bureau's Russian Federation investigation, says he had previously assured Trump he was not personally under investigation.
A spokesman for Trump's private attorney declined to respond to details of the widening probe Wednesday, instead slamming the leaked information as "outrageous, inexcusable and illegal".