The nuclear weapons testing ordered by US President Donald Trump will not involve nuclear explosions at this time, Energy Secretary Chris Wright said on Sunday.

"I think the tests we’re talking about right now are system tests," Wright said in an interview with Fox News. "These are not nuclear explosions. These are what we call non-critical explosions."

The testing involves all the other parts of a nuclear weapon to make sure they are functioning and can set up a nuclear blast, said Wright, whose agency is responsible for testing US nuclear weapons.

The tests will be carried out on new systems to help ensure replacement nuclear weapons are better than previous ones, Wright said on Fox News' "The Sunday Briefing."

Just before his meeting with Chinese leader Xi Jinping in South Korea on

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