[AwesomePossum]

Article I, Section 8, Clause 17 (if I counted correctly)...."The Congress shall have Power to exercise exclusive Legislation in all Cases whatsoever, over such District"......also, Clause 18, and, also, Article III, Section 2, Clause 2, and, also, Article IV, Section 3, Clause 2,and, also, Article VI, Clauses 2 and 3.

It is very clear, in the U.S.Constitution, that Congress shall decide such matters.

[djf]

Yup. And this case is nothing new in jurisprudence. The USSC said the same thing in Downes V Bidwell, 182 US 244, and Hooven, Evatt. 324 US 652.
"Constitutional restrictions and limitations were not applicable to the area of lands, enclaves, territories and possessions over which Congress had exclusive legislative authority."

[FreedomCalls]

It is very clear, in the U.S.Constitution, that Congress shall decide such matters.

And the Second Amendment takes from Congress any power to issue legislation affecting someone's ability to "keep and bear arms." Therefore all gun control legislation in the District is null and void.