WASHINGTON (AP) - NFL commissioner Roger Goodell plans to ask Congress for legislation that would protect collective bargaining agreements from state law challenges, like the one that led to blocking of the suspensions of two players who used banned substances.

Goodell will ask for an amendment to the Labor Management Relations Act at a congressional hearing Tuesday. His testimony was obtained by The Associated Press.

The NFL had attempted to suspend two Minnesota Vikings players, Kevin Williams and Pat Williams, for violating its anti-doping policy. But last month, a federal appeals court essentially allowed them to continue playing while the players' lawsuit is in Minnesota court.

Goodell says that ``called into question'' the viability of the NFL's and other sports league's steroid policies.