According to Joe Scarborough, as reported by TPM, Donald Trump was briefed by a foreign policy expert.  The subject of nuclear weapons came up.

“…Several months ago, a foreign policy expert on the international level went to advise Donald Trump, and three times he asked about the use of nuclear weapons. Three times he asked, at one point, ‘If we have them, why can’t we use them?” Scarborough said.

“Trump asked three times?” commentator Mike Barnicle asked.

“Three times in an hour briefing, ‘Why can’t we use nuclear weapons?’” Scarborough said again.

In a normal world, anyone that seems that interested in using a nuclear weapon in that manner shouldn’t be allowed to be near them.