In the high-stakes court battle over the constitutionality of a federal law that bans all Internet gambling transactions that would be illegal in the gambler’s state, a trio of federal appeals judges in Philadelphia appeared unlikely on Tuesday to strike the law down.

Instead, all three judges on the 3rd U.S. Circuit Court of Appeals panel seemed inclined to uphold the Unlawful Internet Gambling Enforcement Act of 2006 and to reject arguments from two lawyers for a gambling trade association who complained that the wording of the law is so vague it cannot be understood.