Comey, who was sacked by Trump in May, testified in a Senate hearing last week that he believes his dismissal was an attempt to exert influence on the investigation into alleged Russian interference and possible collusion.
Mueller, also a former Federal Bureau of Investigation director, was named special counsel shortly after Comey's dismissal. Trump rhetorically asked in a tweet.
Before that, Trump seemed to question why Clinton wasn't being investigated for ties to Russia-despite the fact that USA intelligence agencies concluded that the country interfered in the election with the goal of helping Trump win.
Clinton and her associates were never charged in the investigation into her use of a private email server and handling of classified information at the State Department.
In addition, US intelligence officials concluded previous year that Russian Federation meddled in the presidential election, seeking to help Trump defeat Clinton.
President Trump has been in a sour mood since reports of special counsel Robert Mueller's investigation into the President's possible obstruction of justice.
Before Thursday, the last time The Briefing had tweeted was November 7, one day before Clinton's historic loss to Trump in the presidential election.
Secret Service: We Don't Know of Any Trump Tapes
Since posting the provocative tweet last month, Trump and his White House aides have been coy as to whether such recordings exist. The Secret Service said this officially and did not want to comment more on this discussion.
Admin revokes blocked program to protect immigrant parents
After Texas and 25 other states challenged the legality of the program, a federal appeals court blocked the program, and the U.S. However, deportations have slightly gone down as less number of people has been caught crossing the Mexican border illegally.