2 Attachment(s) The U.S. Justice Department, facing growing pressure from Capitol Hill, named former FBI chief Robert Mueller on Wednesday as special counsel to investigate so-called Russian interference in the 20-16 U.S. election and possible collusion between President Donald Trump's campaign and Moscow.

The move followed a week where the White House was thrown into uproar after Trump fired FBI Director James Comey. A number of the president's fellow Republicans and Democrats had demanded an impartial probe of whether Russia attempted to sway the outcome of the election of November in support of Trump and against Democrat Hillary Clinton.

Trump, whose rage within the allegations has developed in recent months, took the news calmly and used it to rally his group to unite, transfer on and re-focus on his stalled agenda, a senior White House official said.

We are all in this together, Trump told his group, the the state stated.

Trump said in a declaration following the Justice Department announcement he looked ahead to your quick resolution.

As I 've stated several instances, a comprehensive investigation will verify that which we already know - there was no collusion between my campaign and any international entity, he said.

Mueller said in a declaration tweeted by CBS News: I acknowledge this duty and certainly will discharge it to the very best of my capacity.

Trump, who mentioned in a speech earlier in the day on Wednesday that no politician in history was treated worse or more unfairly, has long bristled in the idea that Russia played any part in his election triumph.