Washington Nationals vice president Bob Boone has informed the club that he will resign instead of complying with a COVID-19 vaccine mandate for all non-uniformed employees, according to a source.

Boone, 73, has been with the organization since 2005 and serves as a senior adviser to general manager Mike Rizzo.

In addition to the resignation of Boone, two scouts will not be with the organization next season due to the vaccine policy, according to additional reporting by The Athletic.

The Nationals were one of the first teams in baseball to require vaccines for non-playing, full-time employees, including coaches, executives and staff. The policy went into effect Aug. 12 and employees needed to meet an Aug. 26 deadline to provide proof of first shot or apply for an exemption.