PORTLAND — A judge overseeing the trial of seven defendants who took over a federal wildlife refuge in Oregon dismissed a juror on Wednesday after questions arose about his impartiality. U.S. District Judge Anna Brown said she would replace the juror with an alternate and then placed deliberations on hold until Thursday, so the replacement juror could travel to Portland from central Oregon. Defendant Ammon Bundy’s defense attorney filed a court motion early Wednesday asking the judge to dismiss the juror over allegations of bias — or to declare a mistrial entirely.