United States, U.S. and Israeli officials have lambasted Palestinian President, Mahmoud Abbas, after he called the American ambassador to Israel a “son of a dog” and a “settler” in a fiery speech the day before.

On Tuesday, Israeli Minister for Regional Cooperation Tzachi Hanegbi called the statement “inflammatory” and “inexcusable.”

“Negotiations, not insults and hate, are the path to peace and prosperity in the region,” Hanegbi said in a tweet a day after U.S. Ambassador to Israel, David Friedman insinuated that the remark is anti-Semitic.

The war of words comes at a low point in U.S.-Palestinian relations. US President, Donald Trump recognized the contested city of Jerusalem as the capital of Israel last December, sparking Palestinian outrage.

President Abbas of Palestine has since said that the U.S can no longer maintain its decades-long role as the main mediator between Israelis and Palestinians, while the White House says it is still planning to release a peace plan.

Speaking at the start of a Palestinian leadership meeting in Ramallah on Monday, Abbas sharply increased tensions with the rival Hamas faction, saying that Hamas was behind an assassination attempt on the Palestinian prime minister on Friday.

Abbas, who controls the West Bank-based Palestinian Authority government, said that he would respond to the attack with “national, legal, and financial measures.”

The Palestinian leader’s strong words appear to foreshadow a new pressure campaign against Hamas, which controls the Gaza Strip.

Abbas has already withheld electricity payments to the coastal enclave in an attempt to mount pressure on Hamas to cede power, causing blackouts for Gaza residents.

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