CIVIL RIGHTS UPDATE: U.S. judge strikes down D.C. concealed-carry gun law as probably unconstitutional.

A federal judge ruled Tuesday that a key provision of the District’s new gun law is probably unconstitutional, ordering D.C. police to stop requiring individuals to show “good reason” to obtain a permit to carry a firearm on the streets of the nation’s capital.

U.S. District Judge Richard J. Leon found that the law violates the “core right of self-defense” granted in the Second Amendment, setting aside arguments from District officials that the regulation is needed to prevent crime and protect the public.

“The enshrinement of constitutional rights necessarily takes certain policy choices off the table,” Leon wrote in a 46-page opinion, quoting a 5-to-4 Supreme Court decision in 2008 in another District case that established a constitutional right to keep firearms inside one’s home.

Leon said the right applies both inside and outside the home.

“The District’s understandable, but overzealous, desire to restrict the right to carry in public a firearm for self-defense to the smallest possible number of law-abiding, responsible citizens is exactly the type of policy choice the Justices had in mind,” he wrote.

Exactly right. Related: Ninth Circuit rules that right to buy guns is part of Second Amendment, strikes down county gun-store ban.