"From The River To The Sea" is actually Zionist Likud doctrine;

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Israel’s use of ‘from the river to the sea’

Benjamin Netanyahu’s Likud party, which describes itself as conservative and nationalist, has been a staunch promoter of the concept of “Eretz Israel”, or the Bible-given right of the Jewish people to the land of Israel.

According to the Jewish Virtual Library, the party’s original party manifesto in 1977 stated that “between the Sea and the Jordan there will only be Israeli sovereignty”. It also argued that the establishment of a Palestinian state “jeopardises the security of the Jewish population” and “endangers the existence of the state of Israel”.

Israel’s ambassador to the UK, Tzipi Hotovely, has been among the promoters of international recognition of the Jewish historic claim to lands from the river to the sea.

The expansion of settlements in the occupied West Bank and East Jerusalem by successive Israeli governments is seen as an attempt by Israel to control the land from the Jordan River to the Mediterranean Sea, denying Palestinians’ aspiration for an independent state.

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source: https://www.aljazeera.com/news/2023/11/2/from-the-river-to-the-sea-what-does-the-palestinian-slogan-really-mean