Fresno State officials announced Thursday that upcoming classes taught by Dr. Lars Maischak have been cancelled “in an effort to minimize disruption and ensure campus safety.”

Maischak is the university lecturer who landed in hot water for violent tweets directed at Pres. Donald Trump, including that the president “must hang” to save American democracy.

All of Maischak’s classes on Monday and Tuesday have been cancelled, with 213 affected students informed via email Thursday. Maischak currently teaches five sections of History 11, which covers American History to 1877.

“Students were also informed that additional information about these courses will be shared with them on Tuesday, April 18,” according to a university statement.

Maischak has received death threats and hundreds of hate emails since the tweet was highlighted by Breitbart News.

“I regret making these tweets,” Maischak told the Associated Press. “I wrote them to an audience of 28 followers on Twitter under the assumption they would be read by people I know.”

The AP also reported that Maischak had temporarily left Fresno during spring break.

Maischak said he is under federal investigation and is keeping the Secret Service abreast of his whereabouts.

“I am not in Fresno. I fear for my life,” he said.

Maischak deleted his Twitter account on Wednesday and says he is prepared to take full responsibility for his statements.