To help sort through the options, Mr. Trump named Robert O’Brien as national security adviser, replacing John Bolton. Mr. O’Brien, a former lawyer with limited government experience, was most recently the State Department’s chief hostage negotiator.

Related: Iran’s foreign minister said today that a military strike by the U.S. or Saudi Arabia would result in “an all-out war.” The warning came after Secretary of State Mike Pompeo accused Iran of an “act of war,” although Mr. Trump has indicated that he would like to avoid a military conflict over an attack that killed no Americans.

Calls for a unity government in Israel

After this week’s election left no party with an outright majority in Parliament, Prime Minister Benjamin Netanyahu today joined his main rival, Benny Gantz, in calling for a unity coalition. However, they’ve done so on conflicting terms.

Mr. Netanyahu is facing possible corruption charges, and his only chance to avoid prosecution would be to remain in the top office. But Mr. Gantz has repeatedly pledged not to enter a coalition with Mr. Netanyahu’s Likud party so long as its leader is facing indictment.

News analysis: The centrist Blue and White party of Mr. Gantz emerged from the voting with a slight advantage over the conservative Likud. “While the country remains deeply divided, the forces of unity have gained an edge,” our correspondents write.