The Brady Center to Prevent Gun Violence issued notice Monday of its intention to file a lawsuit against Gov. Sam Brownback to challenge a sweeping state law nullifying enforcement of federal firearms restrictions in Kansas.

Brownback said in response that attorneys for the state would vigorously defend the gun rights of Kansans.

Attorneys working for the Brady Center plan to challenge the constitutionality of Kansas' law, known as the Second Amendment Protection Act, in U.S. District Court. Details of a legal argument that the state law undermines federal gun laws in Kansas are to be revealed Wednesday during news conferences.