There is no precedent for a sitting president’s relative to host a show on a major television news channel.

The president’s promotion of a speculative digital coin left some crypto investors feeling blindsided, while others saw it as a gimmick that undermined the industry’s credibility.

The president-elect and his family have a direct and potentially lucrative stake in the sale of a cryptocurrency product that surged in value in the hours after going on sale, days before his inauguration.