President Donald Trump recommended an anger management class for Swedish activist Greta Thunberg after she was detained aboard an aid ship aiming to break the Gaza blockade.

On Sunday, the Freedom Flotilla Coalition’s Madleen, crewed by 12 activists, including Thunberg and a minister of the European Parliament, was boarded by Israeli naval forces before it could reach a port in Gaza. The crew was detained, and the ship was brought to the Israeli port of Ashdod. The episode earned the attention of Trump, who was asked about her by the press.