Washington (CNN) President Donald Trump on Tuesday slammed special counsel Robert Mueller's investigation into potential obstruction of justice by him, continuing Trump's crusade against what he believes is a "witch hunt."

"It would seem very hard to obstruct justice for a crime that never happened! Witch Hunt!" the President tweeted early Tuesday.

It would seem very hard to obstruct justice for a crime that never happened! Witch Hunt! — Donald J. Trump (@realDonaldTrump) May 1, 2018

So disgraceful that the questions concerning the Russian Witch Hunt were "leaked" to the media. No questions on Collusion. Oh, I see...you have a made up, phony crime, Collusion, that never existed, and an investigation begun with illegally leaked classified information. Nice! — Donald J. Trump (@realDonaldTrump) May 1, 2018

In another tweet, Trump called the leak of the questions "disgraceful."

"So disgraceful that the questions concerning the Russian Witch Hunt were 'leaked' to the media. No questions on Collusion. Oh, I see ... you have a made up, phony crime, Collusion, that never existed, and an investigation begun with illegally leaked classified information. Nice!" he tweeted.

JUST WATCHED NYT obtains questions Mueller wants to ask Trump Replay More Videos ... MUST WATCH NYT obtains questions Mueller wants to ask Trump 01:58

Mueller is interested in asking Trump a variety of questions related to the 2016 campaign and people from Trump's personal life, business interactions and administration, according to Mueller's list of questions for Trump obtained and reported on by The New York Times

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