More than 1,000 European legislators have published an open letter in opposition to Israeli plans to annex large sections of the occupied West Bank accounting for 30 percent of the territory.

The letter has been published ion several European newspapers, and addresses “serious concerns” about the plans and calls for “commensurate consequences,” without spelling out what they might be.

The annexation vote is being held on July 1, and is being strongly promoted by nationalist Prime Minister Benjamin Netanyahu, supported by President Trump through his so-called Vision for Peace plan.

The letter – signed by 1,080 parliamentarians from 25 countries – has been addressed to European foreign ministries. It warns that Israel’s annexation of West Bank territory would be “fatal to the prospects of Israeli-Palestinian peace and will challenge the most basic norms guiding international relations.”

Its British signatories include Labour MP Dame Margaret Hodge, who campaigned against alleged anti-Semitism in the party.

European names on the list include France’s security subcommittee chair, Nathalie Loiseau, Vice-President of the European Parliament Fabio Massimo Castaldo, and Ireland’s next Prime Minister, Michael Martin.

The letter was the brainchild of a former speaker of the Israeli parliament, Avraham Burg, according to the BBC. More than 420,000 Jews live in over 130 settlements in the occupied territories, built since the 1967 Middle East war. The United Nations considers the settlements to be illegal under international law.

Critics of Israel government policy have been accused frequently in the past of anti-Semitism.

PHOTO: DEAD SEA, West Bank (Reuters) – Palestinians are worried their restricted access to the salty waters of the Dead Sea and its mineral-rich beaches could be cut further if Israel annexes land in the occupied West Bank