WASHINGTON (WDRB) --  President Donald Trump is assailing the naming of a special counsel as "the single greatest witch hunt of a politician in American history!"

Trump is responding to the appointment of former FBI Director Robert Mueller as special counsel to lead a probe of allegations that Trump's campaign collaborated with Russia to sway the election.

In another tweet Thursday morning, he claims, "With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special councel (sic) appointed!"

He did not provide examples or evidence of any alleged "illegal acts."

The former FBI director has a broad mandate that could encompass any questionable actions of President Donald Trump's associates and possibly even the circumstances of last week's abrupt firing of James Comey.

As special counsel, Mueller will direct an FBI counterintelligence investigation examining whether Russia coordinated with Trump campaign associates to influence the election in his behalf. He is entitled to a budget, can request new or additional staff and will have the same authority as high-ranking Justice Department lawyers, including the ability to prosecute any crimes he uncovers.

The White House says an investigation will prove there was no collusion.

Copyright 2017 WDRB News. All Rights Reserved.