Would you have been happy if she had used the Germany phrase Endlösung der Judenfrage because many Jews consider From the River to The Sea as the total destruction of the state of Israel and the Jewish people as the Germans meant by the Final Solution meant getting rid of the Jews from Europe.
Perhaps she should have investigated the origin of the phrase before she used it and not tried to defend herself by saying a Jewish leader had used it before him when the context he was using was quoting a verse from the Torah which talks about water flowing from the Jordan river to the sea.
It's a phrase which both Hamas and Zionists use in their claims over the land of Israel/Palestine. The context and the intent is key.
“Hamas rejects any alternative to the full and complete liberation of Palestine, from the river to the sea,” says the organisation’s 2017 constitution.
The founding charter of Benjamin Netanyahu's Likud party states: “Between the sea and the Jordan there will only be Israeli sovereignty.”
Andy McDonald was suspended from the Labour party for borrowing from the phrase, which some say advocates the eradication of IsraelIsrael and Hamas at war – live updates
www.theguardian.com