A survey of 250 students in the US who sympathise with the phrase "From the river to the sea" showed that:

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16. Ask Hamas: 'From the river to the sea' is a call for the destruction of Israel

Less than 24 hours after Hamas launched its Oct. 7 attack, its representative in Tehran, Khaled Qaddoumi, gave an interview in English to Iran’s Press TV about the “historic event [that] took place in the holy land of Palestine… the Al-Aqsa Flood battle to liberate Palestine from the river to the sea, in order to expel the Zionist regime.”

The following day, he added, in another interview with the IRGC-affiliated Fars News: “We will witness the liberation of the dear homeland of the Palestinian people from the river to the sea, as well as the destruction of the Zionist regime.”

Though the tens of thousands of anti-Israel protesters worldwide chanting “from the river to the sea” fully understand its true meaning, many insist that this phrase is merely an expression of support for the Palestinians and want the world to believe that it is not a call for the destruction of Israel and for killing Jews.

https://www.clevelandjewishnews.com/jns/ask-hamas-from-the-river-to-the-sea-is-a-call-for-the-destruction-of/article_1a500541-b79e-5ea7-bc75-80984cd19cd2.html

a supporter of Zionism; a person who believes in the development and protection of a Jewish nation in what is now Israel: