Bill Maher is once again under fire for a racially-charged joke, this time taking aim at Koreans.

In response to growing tensions between the US and North Korea, the Real Time host tweeted on Friday: 'This N Korean thing is getting tense! I mean, I think it is, I'm on vaca. The ladies at my nail salon are freaking out, that's what I know!'

The comment came just a month after Maher sparked outrage when he called himself a 'house n****' on his HBO show.

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Bill Maher sent out the provocative tweet on Friday afternoon, immediately sparking outrage

The Real Time host (pictured, on the HBO Winter 2007 TCA Press Tour), 61, has come under fire for purporting a stereotype that Koreans work as nail salon staff

The tweet sparked outrage at the stereotype of Asian Americans holding jobs in nail salons.

'[Because] Koreans work at nail salons! Hahahahahaha,' wrote one user.

'This literally reads like a Trump tweet,' said another.

One Twitter user went so far as to take a screenshot of 'how to delete a Tweet' and sent it to the talk show host.

Representatives for Maher and HBO did not immediately respond to request for comment about his North Korea joke.

This is hardly the first time the comedian has been the source of controversy.

On June 2, Maher interviewed Republican Senator Ben Sasse on his show, during which Sasse invited the 61-year-old to his home state of Nebraska and joked about Maher joining him on the farming fields.

'We'd love to have you work in the fields with us,' Sasse said.

Maher hit back: 'Work in the fields? Senator, I'm a house n*****.'

Sasse was the first to apologize on the following morning, saying he should have spoken up when Maher made the comments. Soon after, HBO issued a statement slamming the TV host's 'inexcusable and tasteless' comments.

The 'offensive' tweet came one month after Maher referred to himself as a 'house n****' on his HBO show while interviewing Republican Senator Ben Sasse of Nebraska (pictured)

Maher was previously criticized for inviting Alt-Right provocateur Milo Yiannopoulous onto his show earlier this year (above)

But Maher was the last to apologize - almost 17 hours after his racial slur aired on TV.

'Friday nights are always my worst night of sleep because I’m up reflecting on the things I should or shouldn’t have said on my live show,' Maher said in a statement Saturday afternoon.

'Last night was a particularly long night as I regret the word I used in the banter of a live moment. The word was offensive and I regret saying it and am very sorry.'

At one point, Maher said that comedians like him 'are a trained thing that tries to get a laugh. That's what we...And sometimes we transgress a sensitivity point.'

In May, Maher was criticized for making an incest joke about Ivanka Trump and her father during his show.

He was speaking to New York magazine reporter Gabriel Sherman when he said: 'What do you make of Ivanka and her efforts to sort of humanize her father? We see all this misogyny at Fox News, we see it in Donald Trump himself. A lot of us thought, Ivanka is gonna be our saving grace.'

But the political commentator then took it a step further and mimicked Ivanka performing a sex act on her father.

'When he's about to nuke Finland or something, she's gonna walk into the bedroom and - "Daddy, Daddy…Don't do it, Daddy",' Maher said.

'Is that how you see Ivanka?' Maher asked Sherman who, red-faced, replied: 'No.'