Gov. Sam Brownback has signed a bill into law declaring that the federal government has no power to regulate guns manufactured, sold and kept only in Kansas.

The legislation signed Tuesday also applies to ammunition made, sold and kept in the state. The new law takes effect by the end of next week and makes it a felony for a federal agent to enforce any law, regulation, order or treaty regulating such items.

But the bill also says federal agents won’t be arrested or detained if they face trial for violating the law.

Supporters have worried about the federal government enacting gun-control measures following December’s mass shooting at a Newtown, Conn., elementary school. Critics question whether the measure is constitutional.

Brownback is a strong gun-rights supporter.