At an economic summit of world leaders in Canada Monday, President Trump weighed in on the Israel-Iran conflict, telling reporters Iran would "like to talk, but they should have done that before."He told reporters as he met with Group of Seven summit host Prime Minister Mark Carney that Iran has "to make a deal.

If there is a shared mission at this year’s G7 summit, which begins Monday in Canada’s Rocky Mountains, it is a desire to minimize any fireworks at a moment of combustible tensions.

Israel’s strikes on Iran and Tehran’s retaliation, which appeared to catch many world leaders unawares, is the latest sign of a more volatile world as Trump seeks to withdraw the U.S. from its role a...