Israeli Prime Minister Benjamin Netanyahu said Tuesday he plans to annex much of the West Bank if he’s re-elected next week, a move that would reshape the Palestinian conflict.

Netanyahu said he would annex the Jordan Valley, which would reduce any future Palestinian state to an enclave surrounded by Israel.

“We haven’t had such an opportunity since the Six Day War, and I doubt we’ll have another opportunity in the next 50 years,” Netanyahu told a news conference in Ramat Gan, saying the Trump administration had presented Israel with a unique opportunity.

The announcement came ahead of U.S. plans to roll out its peace proposal shortly after next Tuesday’s vote.

“There is no change in United States policy at this time,” Reuters quoted a Trump administration official as saying when asked whether the White House supported Netanyahu’s move. “We will release our Vision for Peace after the Israeli election and work to determine the best path forward to bring long sought security, opportunity and stability to the region.”

Netanyahu said he hoped eventually to annex all Israeli settlements but would start with the Jordan Valley along the border with Jordan from the Dead Sea to Beit Shean in the north. The valley makes up about 30% of the West Bank.

The Israeli anti-occupation group B’Tselem says about 65,000 Palestinians and 11,000 Israelis live in the West Bank.

Saeb Erekat, the chief Palestinian peace negotiator, said annexation would amount to a war crime under international law. Arab League foreign ministers said the plan would undermine peace talks.

Israel has controlled the West Bank since it seized the territory in the 1967 war. Most of the world considers it occupied territory, but the Trump administration has said it is open to annexation of most of it.

This is not the first time Netanyahu has broached the idea. He first made the suggestion in April, before Israel’s last election, but did not provide any details at that time. Political opponents see the move as a means of securing the support of Israel’s right-wing parties.

Netanyahu, who has been plagued by corruption charges, is in a dead heat in next week’s balloting with Benny Gantz, a former army chief of staff who positions himself as a centrist. He has said Israel should hang onto the Jordan Valley for security reasons.