On April 9, Israelis will go to the polls to choose their next government. The campaign has largely been a referendum on whether Prime Minister Benjamin Netanyahu should remain Israel’s leader in light of his expected indictment in three corruption cases for bribery and breach of trust. With those scandals front and center, policy disagreements have largely been ignored, leaving Israeli voters at risk of unwittingly bringing an avoidable disaster on themselves by annexing territory in the West Bank.

President Trump just raised that risk.

How so? On Twitter on Thursday, he wrote that “it is time for the United States to fully recognize Israel’s Sovereignty over the Golan Heights, which is of critical strategic and security importance to the State of Israel and Regional Stability!” It is the latest, and most important, signal from Washington that Mr. Trump is ready to acknowledge Israeli control of the Golan Heights.

But those signals are also being read by the Israeli right wing as an encouragement to pursue annexation of territory in the West Bank — a far more dangerous step that would present Israel with an unparalleled existential threat to its Jewish and democratic character.

To be sure, there is a big difference between the two territories, both of which came under Israeli control in the 1967 war. The sparsely populated Golan Heights, seized from Syria and annexed by Israel in 1981 in defiance of international criticism, were being used by Syria to bombard Israel’s Galilee region below.