President Donald Trump took aim at Special Counsel Robert Mueller’s probe as unconstitutional in a Monday morning tweet.

The appointment of the Special Councel is totally UNCONSTITUTIONAL! Despite that, we play the game because I, unlike the Democrats, have done nothing wrong! — Donald J. Trump (@realDonaldTrump) June 4, 2018

Trump previously tweeted about the special counsel probe by noting that he had absolute authority to pardon himself for any crimes but that he would never do so because he believes himself not to be guilty.

As has been stated by numerous legal scholars, I have the absolute right to PARDON myself, but why would I do that when I have done nothing wrong? In the meantime, the never ending Witch Hunt, led by 13 very Angry and Conflicted Democrats (& others) continues into the mid-terms! — Donald J. Trump (@realDonaldTrump) June 4, 2018

Trump appeared to allude that he has not taken steps to fire the special counsel despite his belief that the investigation has overstepped its bounds and is not legitimate. The president referenced the “13 very Angry and Conflicted Democrats” in his tweet citing the lawyers assigned to the Mueller investigation with past affiliation with the Democratic Party.