JERUSALEM — Israeli Prime Minister Benjamin Netanyahu vowed on Tuesday to annex the heart of the West Bank if he wins reelection next week, a move that could inflame the Middle East and extinguish any remaining Palestinian hope of establishing a separate state.

Arab leaders angrily condemned Netanyahu’s remarks, and a U.N. spokesman warned the step would be “devastating” to the prospects for a two-state solution.

Netanyahu said he would extend Israeli sovereignty over the Jordan Valley — an area seen as the breadbasket of any Palestinian state — shortly after forming a new government and would move later to annex other Jewish settlements.

From Wire Reports

Such action would swallow up most of the West Bank territory sought by the Palestinians, leaving them with little more than isolated enclaves.

Netanyahu said it was important to act as President Donald Trump prepares to unveil his Mideast peace plan after the Sept. 17 election.

“This is a historic opportunity, a one-time opportunity, to extend Israeli sovereignty on our settlements in Judea and Samaria, and also on other important regions for our security, for our heritage, and for our future,” Netanyahu said, using the biblical terms for the West Bank.

The prime minister was not clear about the status of the Palestinians on the West Bank.

Over 2.5 million Palestinians live there and in east Jerusalem, in addition to nearly 700,000 Jewish settlers. Israel already has annexed east Jerusalem in a move that is not internationally recognized.

Netanyahu is locked in a tight race, and his announcement, the most detailed vision for the region that he has presented during his decade in power, was the latest in a series of frenetic moves he has made in recent days to try to rally hard-line voters.

The proposal was dismissed by opponents as election theatrics. They have accused Netanyahu of trying to divert attention from a corruption scandal and Israel’s security challenges. Later in the day, he was whisked away from a campaign event in southern Israel after Palestinian militants fired rockets toward the area.

Netanyahu’s plan would hinge on a number of factors, most critically whether Trump would back him. But Trump’s team of Mideast advisers is dominated by supporters of the settlements, and the muted reaction Tuesday from the U.S. indicated there would be little resistance.

U.S. officials said Netanyahu had told them about his proposal ahead of time and that they had not raised any objections because they do not believe it will affect prospects for an eventual peace agreement. The officials spoke on condition of anonymity because they were not authorized to talk to the media.

The Israeli leader spoke as the White House announced the firing of national security adviser John Bolton. Bolton was a strong supporter of Netanyahu’s tough policies against Iran and had visited the Jordan Valley with the Israeli leader in June.