None of Your Business

President Donald Trump's itinerary at the G-20 summit in Japan included a meeting with Russian President Vladimir Putin, whose government is accused of using dirty tricks to interfere in the U.S. election to sway things Trump's way. As Trump was leaving the White House, reporters asked if he would bring the subject up and warn Putin and his people not to meddle in the 2020 campaign. Then it happened: "What I say to him," Trump shot back, "is none of your business."

With all due respect, Mr. President -- which I'll admit is very, very little -- it is our business, not just of those covering him...