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By W.J. Hennigan

Mr. Hennigan writes about national security issues for Opinion from Washington.

As President Trump considers pulling American forces into a risky and unpredictable new war in the Middle East, it’s time for the legislative branch to step up. U.S. lawmakers should insist the president obtain a new war authorization from Congress before U.S. forces take any military action against Iran.

While Mr. Trump has so far refrained from committing U.S. military support to Israel’s air campaign, he also hasn’t ruled it out. On Tuesday he called for Iran’s “unconditional surrender,” and mentioned the open possibility of killing Iran’s supreme leader, Ayatollah Ali Khamenei, in a statement posted to his social media site.