The U.S. Department of Homeland Security on Sunday warned Americans that the Israel-Iran conflict is “causing a heightened threat environment in the United States” as the world awaits possible retaliation from Tehran over this weekend’s U.

In August 1964, President Lyndon B. Johnson asked Congress to back his effort to widen the U.S. role in Vietnam. He received it with enactment of the T onkin Gulf Resolution, which passed both chambers of Congress, including the Senate, with only two dissenting votes.

In a social-media post, Trump said U.S. bombers had attacked three Iranian nuclear sites — Fordow, Natanz and Isfehan — in a bid to help crush the country’s ability to produce the ingredients necessary for a nuclear weapon.