Palestinians voiced alarm while Israelis weighed the gravity on Sunday of Prime Minister Benjamin Netanyahu's sudden election promise to annex Jewish settlements in the occupied West Bank.

Some Israeli commentators saw the right-wing leader's pledge on Saturday, as Tuesday's national ballot approaches, as mainly a bid to siphon votes from ultranationalist rivals long advocating annexation.

But after years of resisting far-right calls to formally put West Bank land captured in the 1967 Middle East war under permanent Israeli hold, Netanyahu could be counting on support for a dramatic shift from his close ally, U.S. President Donald Trump.