House Republicans are publicly cheering Trump’s Iran war. Privately, many are worried.

The vast majority of congressional Republicans are publicly supportive of President Donald Trump’s decision to launch a war on Iran. But many are harboring private misgivings about the risks to American troops and global stability — as well as their own political fortunes — should the military campaign drag on indefinitely.

Trump’s comments this week that the bombing could last “four to five weeks” or more, that he doesn’t care about public polling and that the U.S. will do “whatever”...