Timothy Shea was the only one of four defendants in the federal case to face a jury. The former Trump adviser Stephen K. Bannon faces similar charges in state court.
Eleven other members of the panel complained that the juror had injected party politics into the case, which the U.S. attorney said he planned to retry.
Timothy Shea, a key player in the campaign, is on trial in what prosecutors describe as a coordinated plan to funnel money from the $25 million crowdfunding initiative.
After Pardon for Bannon, 2 to Admit Bilking Donors to Border Wall nytimes.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nytimes.com Daily Mail and Mail on Sunday newspapers.