GOP unity over the Iran war started to crack Thursday when Sen. Susan Collins of Maine voted with Democrats to halt the conflict, marking the first time a Republican has changed their vote on the military campaign in the Middle East.

While the vote failed, the shift signaled President Donald Trump could soon face far more resistance over the conflict. That’s especially true as he blows past a legal deadline this week for the U.S. to exit the war without congressional authorization.

Just two Republicans — Collins and Sen. Rand Paul of Kentucky — joined Democrats to support curtailing Trump in a 47-50 vote. Unlike Collins, Paul has supported all…

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