Massachusetts' highest court has ruled a lawsuit challenging Wynn's gambling license can move forward.
The Supreme Judicial Court on Friday concluded a lower court should consider whether the state Gaming Commission violated the open meetings law as it deliberated the Boston-area casino license. It ultimately picked Wynn over Mohegan Sun in 2014.
The court said such a violation could nullify actions taken at the meetings, or result in civil penalties or other legal remedies.
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The court also affirmed Mohegan Sun is entitled to some form of judicial review but not the city of Revere or a local labor union, which had also challenged the Wynn decision.
The commission says its licensing process was "comprehensive, fair and highly transparent" and will be "vigorously" defended in court.
A Wynn Resorts spokesperson said Friday's decision "has no impact on our contruction" and that the casino is still slated to open June 2019.
In a statement, Mohegan Sun said, "This decision affirms our belief that the licensing process was flawed, and the decisions of the Massachusetts Gaming Commission are not immune from further review."