For more than five hours the State Supreme Court listened to lawyers representing the Teachers Unions in Milwaukee and Madison
The historic legislation limits most collective bargaining rights for public union workers.
Teachers unions in both Milwaukee and Madison are suing the state because they feel the law is unconstitutional.
But Wisconsin Attorney General J.B. Van Hollen argued there's nothing in the law that violates any constitutional amendments.
JB Van Hollen said,"It is certainly not a constitutional violation to limit the scope of collective bargaining since it is not a constitutional violation to eliminate constitutional bargaining as a whole."
Lester Pines, the lawyer for Madison Teacher Inc. said "The effect of this legislation is to burden the activities of the unions; to burden individual activities of people in the union which have relied on them for a few decades."
Governor Scott Walker was in Green Bay Monday. Local 5 News asked him whether he was confident Act 10 would be upheld. He said he was:"If somehow this were knocked down or repealed, it would be devastating to schools and local government across the state which have saved nearly $3.5 million over the last 2.5 years."
It could be several months before the State Supreme Court rules on the case.