Never let a crisis go to waste.

WASHINGTON — Two days after the shooting deaths of 26 people at a Newtown, Conn., elementary school, Sen. Dianne Feinstein pledged Sunday that she would introduce new gun-control legislation at the beginning of next year’s congressional session.

“It [the bill] will ban the sale, the transfer, the transportation and the possession,” the California senator said on NBC’s “Meet the Press.” “Not retroactively, but prospectively. And it will ban the same for big clips, drums or strips of more than 10 bullets.”

Feinstein said the purpose of her proposal, a version of the assault-weapons ban that expired in 2004, is to get “weapons of war off the streets of our cities.”

Officials have said that most of those killed in Friday’s massacre — a toll that included 20 children — were shot with a semiautomatic assault-style rifle.

Feinstein has been at the forefront of gun-control efforts nationally. The assault weapons ban that she pushed followed mass killings in a Stockton schoolyard and in a San Francisco office tower.