Trump said the U.S. hit the Fordow, Natanz and Isfahan nuclear sites. Iran’s foreign minister called it a “dangerous military operation” against his country.

In his inauguration speech, Trump said his proudest legacy would be that of peacemaker. Now some of his supporters say he risks betraying that promise if the U.S. joins Israel in its battle with Iran.

• Deadly strikes: Israel and Iran are trading strikes for a sixth day, with civilians in flashpoint areas facing waves of attacks. Israel’s defense minister said the country plans on striking “very ...