Six Democratic presidential candidates sparred in a spirited debate in Las Vegas that included for the first time billionaire Mike Bloomberg as President Donald Trump held a rally in Phoenix. A look at how some of their claims on Wednesday stack up with the facts: MIKE BLOOMBERG, citing his philanthropy’s work with the Sierra Club: “Already we’ve closed 304 out of the 530 coal fire plants in the United States, and we’ve closed 80 out of the 200 or 300 that are in Europe.” THE FACTS: He’s wrongly taking credit for driving the U.S.