Greta Thunberg has hit back at US President Donald Trump, after he suggested she had anger management issues, suggesting he seems “to be suffering from them too”.

It comes after Trump called Thunberg “angry” and said she was a “troublemaker” on Tuesday, following her detention and subsequent deportation by Israel after being part of the flotilla that tried to deliver humanitarian aid to Gaza.

“She’s just a troublemaker. .. She’s no longer into the environment now. She has an anger management problem. I think she should see a doctor,” Trump said.

“Have you ever watched her? She’s a young person. She’s so angry, she’s so crazy.”

Thunberg was aboard the Global Sumud Flotilla, which had tried to reach Gaza to bring aid supplies and draw attention to the plight of the enclave, where most of the 2.2 million residents have been driven from their homes and the United Nations says hunger is rampant.

The 22-year-old Swedish activist was detained along with 478 people in the flotilla and expelled from Israel on Monday.

Thunberg hit back at Trump in an Instagram post on Tuesday.

“I hear Donald Trump has once again expressed his flattering opinions on my character, and I appreciate his concern for my mental health,” she wrote.

“I would kindly receive any recommendations you might have to deal with these so-called ‘anger management problems,’ since – judging by your impressive track record – you seem to be suffering from them too.”

It’s not the first time the pair have clashed, with Trump mocking Thunberg, then 16, after her impassioned 2019 speech at the United Nations in New York urging world leaders to do more to combat climate change.

“She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!” he tweeted at the time.

Thunberg alleges torture

Thunberg has also said she and other detainees of the Gaza flotilla, including some Australians, were subjected to torture in an Israeli prison.

Thunberg told a news conference in Stockholm on Tuesday that she and others were “kidnapped and tortured” by the Israeli military.

She declined to elaborate, adding when pressed that she didn’t get clean water and that other detainees were deprived of critical medication.

“Personally, I don’t want to share what I was subjected to because I don’t want it to make headlines and ‘Greta has been tortured’, because that’s not the story here,” she said, adding that what they were subjected to paled in comparison to what people in Gaza experienced daily.

Israel’s foreign ministry did not immediately respond to a Reuters request for comment but has repeatedly denied mistreating the detainees.

“All detainees … were given access to water, food, and restrooms; they were not denied access to legal counsel, and all their legal rights were fully upheld,” a foreign ministry spokesperson told Reuters last week.

Seven Australians released from Israel and deported to Jordan on Tuesday (local time) have also alleged mistreatment while being detained. Their release followed Australian representations to Israeli authorities over their welfare and treatment.

One detainee, Julie Lamont, said there had not been enough support from Australia.

“We are finally out and it was a really long process and the Australian government is absolutely shameful in our extraction. They have not really supported us,” she told the ABC.

“We were the last people out of 50 nationalities, left there probably. We thought it was because October 7 we would be left there to weather, and now we are here with not much support but we are out.”

A spokesperson for Wong said diplomats had travelled to Ketziot prison in southern Israel, where the detainees were held, multiple times for in-person visits and welfare checks.

“They advocated to Israeli authorities on behalf of the Australians and provided updates to detainees’ families. And officials worked with Israeli authorities to ensure the release and deportation of the Australians. They continue to provide consular assistance,” the spokesperson said.

Israel, which says reports of hunger in Gaza are exaggerated, has dismissed the flotilla as a publicity stunt benefiting Palestinian militant group Hamas.

It had previously detained Thunberg at sea in a similar attempt to breach Israel’s blockade of Gaza in June.

Swedish activists said on Saturday that Thunberg was shoved and forced to wear an Israeli flag.

-with AAP