American Paul Whelan said he is "extremely concerned about being left behind" in Russia again, as the Biden administration looks to cut a deal with the Kremlin to release U.S. detainees. In one of several phone calls over the Christmas holiday, Whelan told WTOP that the Russians are "adamant" about doing "one-for-one exchanges," which he worries will result in Wall Street Journal reporter Evan Gershkovich's release and not his own. "At this point, the five-year mark, I'm extremely concerned about being left behind a third time," Whelan said. "I'm concerned that the Biden administration will work out a deal for...