President Donald Trump on Sunday, May 24, praised Richard Grenell, the acting director of National Intelligence (DNI) for declassifying and releasing a trove of documents related to investigation of the Trump campaign.

“Richard Grenell is a superstar. He had guts, he had courage to do what he did,” President Trump said during an interview with journalist Sharyl Attkisson.

“Richard Grenell has done one of the best jobs I’ve ever seen. I mean, in a short period of time, he exposed them as being corrupt. Look, they were trying to do a takedown of the president of the United States illegally. It’s all illegal,” he continued.

Grenell was nominated in September 2017 to be U.S. ambassador to Germany. Earlier this year, he was called back to Washington to serve as acting DNI to replace Joseph Maguire.

Grenell has made waves after declassifying explosive documents related to Trump-Russia investigation. In April, he declassified footnotes from a Justice Department inspector general’s report, which showed that the FBI had evidence in 2017 that the Steele dossier was a possible product of Russian disinformation. Earlier this month, Grenell released a list of Obama administration officials who were behind the unmasking of former National Security Adviser Michael Flynn.

Grenell said Saturday that he is working on declassifying other documents related to the FBI’s investigation of Flynn, stressing, “It’s very important for the public to see ALL of them. For too long the public has been misled.”

As the Senate voted last week to confirm Rep. John Ratcliffe (R-Texas) as the permanent head of U.S. intelligence, Grenell said he will not be returning to his role as the U.S. ambassador to Germany.

President Trump said he’s disappointed because former Director DNI Dan Coast “didn’t do his job,” and criticized former Attorney General Jeff Sessions as “a disaster.”

“When you look at what Richard Grenell has done in eight weeks, these people didn’t do anything for two and a half years. They should have been exposing this,” the president said.

The president said he has high hopes for Ratcliffe, who will take over from Grenell on Tuesday and predicted he would come out victorious in his war against the “deep state.”

“I think if it keeps going the way I’m going, and Ratcliffe is fantastic. If it keeps going the way it’s going, I have a chance to break the deep state. It’s a vicious group of people. It’s very bad for our country,” the president said.