Former Vermont Gov. Howard Dean (D) tweeted Monday that President Trump needs “psychiatric help," responding to the president's calls for investigators to look into Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s ties to Russia.

This guy desperately needs psychiatric help. https://t.co/344PZBAZ9i — Howard Dean (@GovHowardDean) July 24, 2017

In Trump's original tweet, he wondered why his campaign was the subject of multiple congressional probes and a special counsel, while Clinton, his Democratic opponent in the presidential election and a former secretary of State, was not.

Trump's tweet singled out his own attorney general, Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, calling the longtime supporter "beleaguered."

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Dean has spoken out against Trump in the past, saying that he believes the U.S. is being run by “criminal enterprise” under Trump’s leadership earlier this month.

Dean, a former chairman of the Democratic National Committee and onetime presidential candidate, added that “the real savior of democracy” is Robert Mueller, the special counsel appointed by the Justice Department to oversee the probe into Russian meddling in last year's presidential election.