The public interest research group has joined with other groups to challenge the constitutionality of the law.

The fund said it might challenge the constitutionality of the law.

Some companies are challenging the constitutionality of the Johnson executive order.

"I decided to challenge the constitutionality of this by setting up a tour."

As of yet, no Republican senator is supporting it, and some states might challenge its constitutionality.

In its defense, the company challenged the constitutionality of the flow control law.

He did not challenge the constitutionality of the racial restrictions.

He should drop any plans to challenge the constitutionality of that transfer.

The city then challenged the act's constitutionality, ultimately sending the issue to the high court.

The money will be used to keep the program going until the resolution of lawsuits challenging its constitutionality.