I don't know Specter's motives, nor am I commenting on if he should be doing this, but the congress does have authority to regulate the NFL as they are specifically given authority over interstate commerce (the NFL is a business involved in primarily interstate commerce) via Article 1, Section 8, Clause 3 of the United States Constitution,
The Congress shall have power...
To regulate commerce... among the several states...
To constitute tribunals inferior to the Supreme Court;
and the Pat's cheating is business fraud of the other team(s) and of paying customers.