Mattis’ comments came under questioning from California Democrat Sen. Dianne Feinstein, who has been waging a lonely fight against one nuclear weapons system in particular, the Long Range Stand-Off, or LRSO, air-launched nuclear cruise missile.

“I do not see it as an effective deterrent weapon,” Feinstein said. “I see it as Russia taking action to counter it and with the cost and the fact that we’ve got new ballistic missile submarines, new bombers, new intercontinental ballistic missiles and new warheads, I wonder why we need to develop this specific weapon? The cost is going to be inordinate.”

Mattis is referring to the Pentagon’s Nuclear Posture Review, a top-to-bottom assessment of U.S. nuclear capabilities and strategy, including the Cold War era “triad” of bombers, submarines and ground missiles designed to ensure the U.S. could counterattack after a first strike……

Feinstein seemed to be encouraged when Mattis said he would be consulting with former Defense Secretary William Perry, who has advocated eliminating one leg of the triad by phasing out the land-based intercontinental ballistic missiles.

Perry is also strongly opposed to developing new nuclear cruise missiles, which he says are “uniquely destabilizing” weapons, because an adversary cannot tell a conventional missile from a nuclear-armed version, risking miscalculation in a crisis.

“I register loud and clear the potential destabilizing view that some people see this weapon bringing and I’m taking that on board,” Mattis said. “But I’ve got to do more study.”

Feinstein said she has had extensive discussions with people in the military and has concerns that the LSRO may in fact represent a new generation of nuclear missiles not just an upgrade of older air-launched missiles.

“It’s got features which concern me greatly,” she said. “I’m not sure for the cost that we’ll end up with a practical deterrent.”…..http://www.washingtonexaminer.com/jim-mattis-says-hes-open-to-rethinking-triad-nuclear-cruise-missile/article/2625999