The lawsuit filed in U.S. District Court in Bangor asserts that the new law needlessly delays exercising of the 2nd Amendment without determining whether a gun buyer should possess a firearm.

Gun rights advocacy groups are challenging Maine's 72-hour waiting period for gun purchases, arguing that it’s unconstitutional.

A coalition of gun rights groups is suing Maine over a law requiring a three-day waiting period to buy a firearm, arguing that the new requirements violate the Constitution. The lawsuit, filed in U.S.