The White House on Monday defended President Obama’s decision to enter into the Paris climate accord without Senate ratification but stopped short of confirming a Chinese report that he will do so this week during his trip to China. Still, it would surprise no one if Mr. Obama and Chinese President Xi Jinping were to announce the ratification of the sweeping climate change agreement before the Sunday opening of the Group of 20 summit in Hangzhou, Zhejiang. White House senior adviser Brian Deese said the president has the legal authority to ratify the accord without the two-thirds Senate vote required...