The Fox News host Sean Hannity launched an angry attack on the former special counsel Robert Mueller on Wednesday night.

"Number one, Robert Mueller doesn't know the law — he's basically full of crap," Hannity said.

Earlier Wednesday, Mueller broke his two-year silence and briefed the press on his investigation into Russian election interference and possible obstruction of justice by President Donald Trump.

"If we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller said, reiterating the report on his investigation.

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The Fox News opinion host Sean Hannity on Wednesday night launched into a furious attack on Robert Mueller, saying the former FBI director who led the special counsel's Russia investigation "doesn't know the law" and is "basically full of crap."

Earlier Wednesday, Mueller delivered his first public remarks since being appointed special counsel two years ago to lead the investigation into Russian election interference and possible obstruction of justice by President Donald Trump.

"If we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller said, reiterating his report and further puncturing Trump's claim that the report amounts to a "total exoneration" of him.

Mueller emphasized that Department of Justice regulations prevented a sitting president from being charged with a crime and that he therefore felt it unfair to even accuse the president of such wrongdoing.

Hannity devoted the opening eight minutes of his show on Wednesday to attacking Mueller.

"Now today he officially resigned from the office of special counsel but not before showing the world, of course, what we already know on this program — his partisan-hackery true colors if you will," a visibly angry Hannity said.

"We have a career bureaucrat, nothing more than a Trump-hating partisan who is now all but cheering for impeachment based on nothing."

"Number one, Robert Mueller doesn't know the law — he's basically full of crap," Hannity said.

Before being named special counsel in charge of the Department of Justice and FBI's Russia investigation, Mueller spent 12 years as head of the FBI, ending his term in 2013. Before then he spent several decades as an attorney and law-enforcement official.

On his show, Hannity echoed Trump's accusations that Mueller, who has previously registered as a Republican, was a partisan bent on undermining the administration.

"Mueller's continued public smear of a duly elected president who has been charged with no crime is completely unethical and immoral," Hannity said.

"And Mueller's actions today had nothing to do with justice. Everything to do with politics. And his presser today served one purpose, and that was to help the Democrats, give them another political bone to chew on."

Trump, who is a friend of Hannity's, sent a tweet congratulating the Fox News host on a "great show tonight."

Earlier, Trump had written: "Nothing changes from the Mueller Report. There was insufficient evidence and therefore, in our Country, a person is innocent. The case is closed! Thank you."

Mueller in April submitted his long-awaited report to the Justice Department, and a redacted version was released to Congress three weeks later.

In the report, Mueller said there was not sufficient evidence to charge Trump or any of his campaign officials with conspiracy related to Russia's 2016 election meddling.

He declined to issue a conclusion, however, over whether the president had obstructed justice in connection to the investigation, citing the Justice Department rules he again mentioned Wednesday.

Attorney General William Barr and his deputy, Rod Rosenstein, decided that the evidence in the report did not constitute obstruction.