A Quote by Lawrence M. Krauss

Donald Trump's candidacy has been a source of anxiety for many reasons, but one stands out: the ability of the president to launch nuclear weapons. When it comes to starting a nuclear war, the president has more freedom than he or she does in, say, ordering the use of torture.
What is the only provocation that could bring about the use of nuclear weapons? Nuclear weapons. What is the priority target for nuclear weapons? Nuclear weapons. What is the only established defense against nuclear weapons? Nuclear weapons. How do we prevent the use of nuclear weapons? By threatening to use nuclear weapons. And we can't get rid of nuclear weapons, because of nuclear weapons. The intransigence, it seems, is a function of the weapons themselves.
I think Donald Trump is very, very cautious about nuclear weapons, and he's seriously concerned. And this might be one of the reasons he wants to deal with Putin carefully, because he's aware of how many nuclear weapons Putin has, and that Russian doctrine is much more open about using nuclear weapons than is American doctrine.
On January 20, 2017, Trump will be sworn in as the 45th president of the United States, and he will be given the nuclear codes and the power to launch the U.S. nuclear arsenal, which is comprised of some 7,000 nuclear weapons. A military officer will always be close to Trump, carrying the nuclear codes in a briefcase known as the "football."
The bottom line on nuclear weapons is that when the president gives the order, it must be followed. There's about four minutes between the order being given and the people responsible for launching nuclear weapons to do so. And that's why 10 people who have had that awesome responsibility have come out and, in an unprecedented way, said they would not trust Donald Trump with the nuclear codes or to have his finger on the nuclear button.
The worst part of what we heard Donald [trump] say has been about nuclear weapons. He has said repeatedly that he didn't care if other nations got nuclear weapons, Japan, South Korea, even Saudi Arabia. It has been the policy of the United States, Democrats and Republicans, to do everything we could to reduce the proliferation of nuclear weapons.
Presidents should be very careful at all times in discussing the use or non-use of nuclear weapons. Presidents since the cold war have used nuclear deterrence to keep the peace, and I don't believe that any president should make any blanket statements with respect to the use or non-use of nuclear weapons.
The cavalier casual way that Donald Trump talks about nuclear weapons is not only frightening but it goes counter to more than 70 years of bipartisan, presidential leadership of Republicans and Democrats who believed that we have to prevent other countries from getting nuclear weapons and we have to do what we can to decrease the number of nuclear weapons in the world.
I don't want to use the term "nuclear weapons" because those people in Iran who have authority say they are not building nuclear weapons. I make an appeal to the countries who do have nuclear weapons. They don't consider them a nuclear threat. But let's say a country that doesn't have nuclear weapons gets involved in building them, then they are told by those that already have nuclear weapons that they oppose [such a development]. Where is the justice in that?
On many issues, including on the use of nuclear weapons, it is not clear where [Donald] Trump stands, due to his contradictory statements.
I, who had been in favour of nuclear energy for generating electricity ... I suddenly realised that anybody who has a nuclear reactor can extract the plutonium from the reactor and make nuclear weapons, so that a country which has a nuclear reactor can, at any moment that it wants to, become a nuclear weapons power. And I, right from the beginning, have been terribly worried by the existence of nuclear weapons and very much against their use.
Donald Trump, having spent decades in the public eye as an entertainer, may not understand what the nuclear triad is, or what America's 'first use' nuclear policy is, or why starting a trade war would be a disaster. But he does understand storytelling, the power of a clear narrative, and the importance of stirring emotion.
As far as U.S. intelligence knows, Iran is developing nuclear capacities, but they don't know if they are trying to develop nuclear weapons or not. Chances are they're developing what's called 'nuclear capability,' which many states have. That is the ability to have nuclear weapons if they decide to do it. That's not a crime.
We have a legal and moral obligation to rid our world of nuclear tests and nuclear weapons. When we put an end to nuclear tests, we get closer to eliminating all nuclear weapons. A world free of nuclear weapons will be safer and more prosperous.
Basically [United States and France] said "We will use nuclear weapons whenever it suits our purposes to do so." So this expansion of doctrines regarding possible use of nuclear weapons makes them more, you know, sort of, salient and important and so it's increasing the perceived political value of nuclear weapons and therefore causing or contributing to possible proliferation.
Donald Trump is a person who has been very cavalier, even casual about the use of nuclear weapons.
Iran's Supreme Court has issued a fatwa against the development of nuclear weapons. President [Hassan] Rouhani has indicated Iran will never develop nuclear weapons. I've made clear that we respect the right of the Iranian people to access peaceful nuclear energy in the context of Iran meeting its obligations.
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