Portsmouth / AFP Donald Trump has challenged his rival Hillary Clinton to a drug test before their next debate, suggesting the Democrat was “pumped up” on performance-enhancing drugs in a stunning new twist to the brutal White House race. The unsubstantiated attack from the Republican nominee came as a new poll out Sunday shows Clinton with a four-point lead …

  A Wall Street executive offered advice on how to deflect criticism for taking money from Wall Street. There was an invitation to spend a weekend at George Soros’s Southampton estate. These and many other tidbits are in the leaked e-mails of Hillary Clinton’s campaign chairman, John Podesta. Guess what else? It turns out that politics influences the Democratic nominee’s …

  Uber now offers rides in more than 200 U.S. cities. Rival Lyft does too. But Uber gets an estimated 60 percent of its U.S. revenue from just five metropolitan areas (New York, San Francisco, Los Angeles, Chicago and Washington), according to a new report from the research firm 7Park Data. There is a similar regional concentration in ride-business data …