Donald Trump has branded Greta Thunberg a 'trouble-maker' with an 'anger management problem' and has suggested she see a doctor after the climate activist was deported from Israel. The Swedish campaigner was among 171 members of the Global Sumud Flotilla released from Israeli detention on Monday after the IDF foiled their attempt to bring aid into Gaza. When asked about Thunberg during a press conference at the Oval Office on Monday, the US president made some scathing remarks about the young activist.'She's just a trouble-maker. You mean she's no longer into the environment, now she's into this?''She has an anger management problem, I think she should see a doctor'. But Thunberg was quick to fire back at Trump with a sarcastic Instagram post on Tuesday, in which she asked the president to give her tips on how to handle her apparent anger issues. 'I heard Donald Trump once again has expressed his very flattering opinions on my character, and I appreciate his concerns for my mental health', she wrote. 'To Trump: 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.' US President Donald Trump called Greta Thunberg a 'trouble-maker' with an 'anger management problem' after the Swedish activist was released from Israeli detention on Monday Swedish climate campaigner Greta Thunberg raises her fist, upon arrival alongside activists who were sailing aboard vessels from the Gaza-bound aid flotilla before being stopped and detained by Israeli forces, greeted by a crowd of supporters, at the arrivals area of Athens International Airport on October 6, 2025 Thunberg clapped back at Trump with a sarcastic Instagram post This is the latest exchange between Thunberg and Trump after the president mocked the activist in 2019 when she was named Time Magazine's Person of the Year. Thunberg's witty remark also comes after she spoke to reporters in Athens on Monday following her deportation from Israel.'Let me be very clear. There is a genocide going on,' Thunberg told the crowd at the Athens airport referring to Israeli military action in Gaza.'Our international systems are betraying Palestinians. They are not even able to prevent the worst war crimes from happening,' she said. 'What we aimed to do with the Global Sumud Flotilla was to step up when our governments failed to do their legal obligation.'Thunberg and fellow activists attempted to reach Gaza in scores of vessels to bring aid supplies and draw attention to the plight of Gaza, where most of the 2.2 million residents have been driven from their homes and the United Nations says hunger is rampant.Israel, which rejects accusations it is carrying out genocide in Gaza and says reports of hunger there are exaggerated, has dismissed the flotilla as a publicity stunt benefiting Hamas. It had previously detained Thunberg at sea in a similar attempt to breach the blockade in June. Swedish activist Greta Thunberg walks before her deportation at an unspecified Israeli airport, after Israel intercepted the vessels of the Global Sumud Flotilla aiming to reach Gaza and break Israel's naval blockade, October 6, 2025 in this handout imageEarlier, Swiss and Spanish activists from the flotilla said they were subjected to inhumane conditions during their detention by Israeli forces.Israel's foreign ministry issued a statement, accompanied by photos of Thunberg at the airport, saying all participants' legal rights had been upheld and the only violence involved an activist who bit a female medic at Israel's Ketziot prison.Among nine members of the flotilla who arrived home in Switzerland, some alleged sleep deprivation, lack of water and food, as well as some being beaten, kicked, and locked in a cage, the group representing them said in a statement. An Israeli foreign ministry spokesperson rejected the allegations.Spanish activists also alleged mistreatment on their arrival in Spain late on Sunday after being deported.'They beat us, dragged us along the ground, blindfolded us, tied our hands and feet, put us in cages and insulted us,' lawyer Rafael Borrego told reporters at Madrid's airport.Swedish activists said on Saturday that Thunberg was shoved and forced to wear an Israeli flag during her detention, while others said they had clean food and water withheld and had their medication and belongings confiscated. Thunberg and fellow activists attempted to reach Gaza in scores of vessels to bring aid supplies and break Israel's naval blockade Smoke rises after Israeli airstrikes targeted residential areas in the Gaza Strip, as seen from Israel near the border, on October 07, 2025 Palestinians wait in line for clean water distributed by charitable organizations in Az-Zawayda, Gaza on October 06, 2025After she arrived in Athens, Thunberg said she could 'talk for a very, very long time about our mistreatment and abuses in our imprisonment, trust me, but that is not the story'.'What happened here was that Israel, while continuing to worsen and escalate their genocide and mass destruction with genocidal intent, attempting to erase an entire population, an entire nation in front of our very eyes, they once again violated international law by preventing humanitarian aid from getting into Gaza while people are being starved.' Israel's foreign ministry has described widespread reports of detainees being mistreated after the flotilla was intercepted as 'complete lies'.A spokesperson told Reuters over the weekend that all detainees were given access to water, food, and restrooms, adding: 'they were not denied access to legal counsel and all their legal rights were fully upheld'.On Sunday, the Swiss Embassy in Tel Aviv visited 10 Swiss nationals and said all were 'in relatively good health, given the circumstances'.Former Barcelona Mayor Ada Colau, who was also on the flotilla, said there had been 'mistreatment, but that was nothing compared to what the Palestinian people suffer every day'. Israel's campaign in Gaza was triggered by Hamas's October 7, 2023, attack on southern Israel, in which terrorists killed some 1,200 people and abducted 250 others. Pictured: A woman reacts as families of Israeli hostages and supporters protest outside Israeli Prime Minister Benjamin Netanyahu's residence, marking the two-year anniversary of the deadly October 7, 2023 attack on Israel by Hamas from Gaza, in Jerusalem, October 7, 2025Israel's campaign in Gaza has killed more than 66,000 Palestinians and wounded nearly 170,000 others, according to Gaza's Hamas-run Health Ministry.The ministry does not differentiate between civilians and militants in its toll, but has said women and children make up around half of the dead.Its campaign was triggered by Hamas's October 7, 2023, attack on southern Israel, in which terrorists killed some 1,200 people and abducted 250 others.Most of the hostages have been freed under previous ceasefire deals.