US President Donald Trump hits back at the appointment of a special counsel to lead a federal investigation into allegations that his campaign collaborated with Russia to sway the 2016 election that put him in the White House.

“With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special councel (sic) appointed,” he writes in a tweet.

“This is the single greatest witch hunt of a politician in American history!” he follows up in a subsequent tweet.

Earlier today, deputy Attorney General Rod Rosenstein announced former FBI director Robert Mueller would take over the investigation from FBI director James Comey, whom Trump fired last week.

Mueller will have sweeping powers and the authority to prosecute any crimes he uncovers.

— with AP

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