WASHINGTON — A group of lawmakers spanning a broad ideological spectrum is raising alarms about the possibility of the United States taking an active role in the conflict between Israel and Iran.

The emerging coalition unites strange bedfellows, including some of President Donald Trump’s most fervent supporters and progressive Democrats, who have been vocal opponents of U.S. involvement in foreign entanglements in the years following the Afghanistan and Iraq wars, particularly without congressional approval. It could also represent a serious threat to the stranglehold Trump holds over the hard-right base of the Republican Party.

Rep. Thomas Massie, R-Ky., a libertarian who has not been afraid to buck Trump on fiscal issues, is teaming up with Rep. Ro Khanna, D-Calif., to attempt to force a vote on a war powers resolution that would require the administration to get approval from Congress before participating in the conflict in any meaningful way.