President Biden has expressed concern that the circumstances of the assassination have thrown cease-fire talks into doubt, but Prime Minister Benjamin Netanyahu of Israel rejects that idea, officials say.

Mr. Biden contended that the assassination of Mr. Haniyeh was poorly timed, coming right at what the Americans hoped would be the endgame of the process, according to the U.S. official, who likewise did not want to be identified describing private talks. Moreover, Mr. Biden expressed concern that carrying out the operation in Tehran could trigger the wider regional war that he has been trying to avert.