'PERPETUAL CONFLICT'
Hanan Ashrawi, a senior official in the Palestine Liberation Organization, said on Twitter after Netanyahu's announcement that the Israeli leader was out to impose a "greater Israel on all of historical Palestine and (carry) out an ethnic cleansing agenda".
"All bets are off. Dangerous aggression. Perpetual conflict," she wrote.
Israeli-Palestinian peace talks collapsed in 2014 and Palestinians have called Trump's proposal dead in the water, even before its publication, citing what they see as his pro-Israel policies.
Last March, just before Israel's previous election, Trump - in a move widely seen as an attempt to bolster Netanyahu - recognised Israel's 1981 annexation of the Golan Heights, captured from Syria in the 1967 conflict.
"It's an election stunt and not a very impressive one because it's so transparent," Yair Lapid, co-leader of the centrist Blue and White Party, said in a statement about Netanyahu's plan.
Blue and White, led by former armed forces chief Benny Gantz, and Likud are running neck and neck in opinion polls.
The Jordan Valley, which Palestinians seek for the eastern perimeter of a state in the West Bank and Gaza Strip, stretches from the Dead Sea in the south to the Israeli city of Beit Shean in the north.
The 2,400 square km (926.65 square mile) valley accounts for nearly 30 percent of the territory in the West Bank. Israel has long said it intends to maintain military control there under any peace agreement with the Palestinians.
