Senate Majority Leader Mitch McConnell (R-Ky.) is readying a vote to force senators to indicate whether they back keeping the U.S. in the Paris climate agreement.

McConnell’s strategy is similar to the one he used in March to force Senate Democrats, including those hoping to win the White House in 2020, to say whether they back the ambitious climate change and green jobs platform known as the Green New Deal. That March 26 floor showdown over a resolution backing the Green New Deal ended with the Senate voting it down 0-57, and 43 Democrats voting “present” in protest.

This time...