Israeli leaders slammed Palestinian President Mahmoud Abbas Monday for a fiery, invective-filled speech against U.S. President Donald Trump, in which he proclaimed the U.S. role as arbiter of the Mideast conflict over, attacked the administration’s envoys and described Israel as a colonial conspiracy, The Star reported.

Israeli Defence Minister Avigdor Lieberman said Abbas had “lost his senses” and had given up on the prospect of peace negotiations in favour of open confrontation with both Israel and the United States. Israeli Education Minister Naftali Bennett, head of the pro-settler Jewish Home Party, said the speech represented Abbas’ swan song.

Prime Minister Benjamin Netanyahu, during a trip to India, said Abbas had “tore off the mask” and exposed what he called the truth. “The root of the conflict between us and the Palestinians is their continuous refusal to recognize the Jewish state in any borders,” he said in a statement on Facebook.

In a rambling, two-and-a-half hour long speech Sunday night, the Palestinian leader sharply escalated his rhetoric, lashing out at the U.S., Israel, Britain and even other Arab leaders, whom he told to “go to hell” for criticizing him. He pronounced the peace process dead, and accused Israel of killing it.