The 68-year-old former secretary of state said Trump's "cavalier" attitude about nuclear weapons, the number one threat in the world, is "deeply troubling" as she assured US allies that if elected, her administration would stand behind the country's commitment to them.
"So a man who can be provoked by a tweet should not have his fingers anywhere near the nuclear codes, as far as I think anyone with any sense about this should be concerned," Clinton said in response.
Clinton also slammed Trump for his alleged rhetoric on nuclear weapons.
"What we heard Donald say 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 US, Democrats and Republicans, to do everything we could to reduce the proliferation of nuclear weapons.
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"Nuclear is the single greatest threat. Just to go down the list, we defend Japan, we defend Germany, we defend South Korea, we defend Saudi Arabia, we defend countries. They do not pay us. But they should be paying us, because we are providing tremendous service and we're losing a fortune," he asserted.
Responding to a question Trump ruled out taking out nuclear option off the table.
"We have to be prepared. I can't take anything off the table. Because you look at some of these countries, you look at North Korea, we're doing nothing there. China should solve that problem for us. China should go into North Korea. China is totally powerful as it relates to North Korea," he said and described the Iranian nuclear agreement as the worst deal.
"Words matter. Words matter when you run for president. And they really matter when you are president. And I want to reassure our allies in Japan and South Korea and elsewhere that we have mutual defence treaties and we will honour them. It is essential that America's word be good," Clinton said.
Besides nuclear weapons, Clinton also said that cyber security and warfare will be one of the biggest challenges facing the next president.
"I think cyber security, cyber warfare will be one of the biggest challenges facing the next president.
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