This week, Senators John McCain (R-Ariz.) and Jon. Tester (D-Mont.), and Reps. Travis Childers (D-Miss.) and Rep. Mark Souder (R-Ind.), introduced the âSecond Amendment Enforcement Act.â The Senate and House bills (S. 3265, with 14 Senate cosponsors and H.R. 5162, with 64 House co-sponsors, respectively) would eliminate several of the Districtâs most restrictive gun control laws passed in the wake of the U.S. Supreme Court's landmark 2008 decision in District of Columbia v. Heller.