World leaders had gathered Monday in Canada with the specific goal of helping to defuse a series of global pressure points, only to be disrupted by a showdown over Iran’s nuclear program that could escalate in dangerous and uncontrollable ways.

World leaders at the Group of Seven summit in Canada scrambled Monday to find a way to contain the escalating conflict between Israel and Iran.

US President Donald Trump was leaving a Group of Seven summit early on Monday as he hinted of greater involvement in the Israel-Iran conflict after issuing an ominous warning for the capital Tehran to evacuate.