UK Prime Minister Rishi Sunak has taken aim at a popular pro-Palestinian chant that has been used in rallies across the world, Al Jazeera reports.

“Those who chant ‘from the river to the sea’ are either useful idiots who do not understand what they are saying, or worse, people who wish to wipe the Jewish state from the map,” he said during a speech at the British parliamentary group Conservative Friends of Israel.

“We will have zero tolerance for those who promote or glorify terrorism or pedal anti-Semitism on our streets.”

For pro-Palestinian groups, the chant expresses the desire for freedom from oppression across the historical land of Palestine, but Israel backers claim it is a call to violence and anti-Semitic, according to Al Jazeera.