BUENOS AIRES, Argentina (AP) — Leaders of the world's top economies agreed Saturday to repair the global trading system as they closed a Group of 20 summit that saw the Trump administration at odds with many allies over the Paris accord on climate change and issues like migration.

The joint statement signed by all 20 member nations said 19 of them reaffirmed their commitment to the Paris climate accord, with the United States, which withdrew from the pact under President Donald Trump, the lone holdout. The official communique acknowledged flaws in global commerce and called for reforming the W...