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Alan Dershowitz said that the Justice Department made very clear that sitting presidents cannot be "indicted, prosecuted, or tried while serving in office."

The Harvard law professor reminded everyone that the president must first be impeached and removed from office before he can be charged with a crime.

The information waters have been murky lately on what exactly is being investigated as far as alleged collusion between the Trump campaign and Russia.

The Washington Post reported last week that Special Counsel Robert Mueller is currently investigating the president for obstruction of justice over his firing of former FBI Director James Comey. Subsequent reports contradicted this, saying that Mueller has not decided whether to investigate the president.

Regarding the investigation Dershowitz said, "The answer is 'ish.' He's under investigation 'ish.'"

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"The president would be making a terrible mistake by getting into the weeds of arguing the facts rather than sticking to the conceptual constitutional issues," Dershowitz said.

He was quick to lament that President Trump often finds himself the weeds because he is always tweeting.

"If I were the president's lawyer the first thing I would do is bring some masking tape and a pair of mittens," Dershowitz quipped.

"This president got elected by tweeting so no lawyer is going to tell him to stop tweeting," he admitted.

Dershowitz told Martha MacCallum that Trump is "entitled to make judgments" for what's in America's best interest when it comes to Russia.

"Imagine if a single prosecutor could end the presidency of somebody by simply indicting them," he said.

Watch the clip above, and check out further analysis from Dershowitz below.

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