Robert De Niro dropped the f-bomb on US TV as he hit back at critics who disagree with his anti- Donald Trump stance.

Robert De Niro dropped the f-bomb — twice — on US TV on Sunday (local time) as he hit back at critics who disagree with his anti-​Donald ​Trump stance.

“F​**k ‘em. F**k ‘em,” De Niro said after trashing Mr Trump and those on the president’s side on during an appearance on CNN.

A voice from off-set could be heard yelling “Woahhhh,” at De Niro’s double four-letter drop.

“Sorry. Sorry,” the actor said.

“This is cable, so it’s not an FCC violation, but it still is a Sunday morning,” host Brian Stelter commented.

During the full interview, which Stelter posted online, De Niro said he believed the US President wasn’t capable of resigning from office, reports the New York Post.

He also described the president as a “gangster” and called Mr Trump “crazy.”

Stelter asked if De Niro meant in the medical sense.

“Possibly medically too,” De Niro said.

“I didn’t think that before, but now I actually — when I saw him out in front of the helicopter waiting to go somewhere, talking endlessly and sweating and sweating … this guy, he’s not even aware of what he’s — he should at least ask somebody for a handkerchief or something and dry himself off.”

“There’s just something very strange,” the actor added.

Stelter asked ​the “Taxi Driver” star if he thought Trump’s behaviour could be acting.

“In some ways, I think he is,” De Niro answered. “As I think some of these pundits are too,” he volunteered. “Because I can’t believe they would actually buy into this craziness. This guy should not be president, period.”

GIULIANI WOULD CO-OPERATE WITH IMPEACHMENT PROBE

Meanwhile, Mr Trump’s embattled personal lawyer Rudy Giuliani said he would co-operate with an impeachment inquiry only if Mr Trump gave him permission.

“If he decides that he wants me to testify, of course I’ll testify,” Giuliani said during a series of weekend television appearances in the US where impeachment dominated the discussions.

But it’s not clear whether Democrat Adam Schiff, whose House Intelligence Committee is taking the lead on the impeachment investigation, wants to hear sworn testimony from Giuliani.

Central to the Democratic-led inquiry is Mr Giuliani’s effort to have Ukraine conduct a corruption probe into 2020 presidential candidate Joe Biden and his son Hunter’s dealings with a Ukrainian energy company.

Mr Trump echoed that request in a July call with Ukraine’s president that has now led to the impeachment drive examining whether Mr Trump linked US aid to Ukraine in exchange for that probe.

There has been no evidence of wrongdoing by either Biden.

For now, Mr Schiff is working to strike a deal with the anonymous whistleblower whose complaint forms the heart of the proceedings against the 45th president.

For Mr Trump, the head-spinning developments pose a threat like none he’s encountered before, even from the special counsel Robert Mueller report over Russia’s meddling in the 2016 elections.

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The release last week of a rough transcript of Mr Trump’s July 25 call with Ukrainian President Volodymyr Zelensky and the whistleblower’s complaint have put Mr Trump’s own words and actions under heightened scrutiny. Democrats are waiting to see how the White House responds to congressional demands for testimony and documents.

“If they’re going to obstruct, then they’re going to increase the likelihood that Congress may feel it necessary to move forward with an article on obstruction,” Mr Schiff said.

He said the committee was expecting an agreement for the whistleblower’s testimony “very soon”.

During his TV appearances, Mr Giuliani not only repeated allegations that Ukraine, and not Russia, meddled in the 2016 US elections, but also brandished what he said were affidavits that support them and claimed that Mr Trump “was framed by the Democrats”.

While Mr Trump was at his golf club in Virginia, his former homeland security adviser suggested Mr Giuliani would be doing the president a disservice by espousing the false story that Ukraine meddled.

“I am deeply frustrated with what he and the legal team is doing and repeating that debunked theory to the president,” said Tom Bossert, who also was an adviser to former president George W Bush.

“That conspiracy theory has got to go, they have to stop with that, it cannot continue to be repeated.”

— with the New York Post