Incoming National Security Advisor, Charles Kupperman, made the claim Nuclear War With USSR Was Winnable.

He made those statements in the 1980s. I do not know his views today, but let's review what he said then.

President Donald Trump’s acting national security adviser, former Reagan administration official Charles Kupperman, made an extraordinary and controversial claim in the early 1980s: nuclear conflict with the USSR was winnable and that “nuclear war is a destructive thing but still in large part a physics problem.”

Kupperman, appointed to his new post on Tuesday after Trump fired his John Bolton from the job, argued it was possible to win a nuclear war “in the classical sense,” and that the notion of total destruction stemming from such a superpower conflict was inaccurate. He said that in a scenario in which 20 million people died in the U.S. as opposed to 150 million, the nation could then emerge as the stronger side and prevail in its objectives.

His argument was that with enough planning and civil defense measures, such as “a certain layer of dirt and some reinforced construction materials,” the effects of a nuclear war could be limited and that U.S. would be able to fairly quickly rebuild itself after an all-out conflict with the then-Soviet Union.