On Sunday, Energy Secretary Chris Wright clarified that the recent weapons testing directive from President Trump will not involve nuclear detonations.

“The tests we’re currently discussing are system tests, not nuclear explosions. These involve what we refer to as noncritical explosions,” Wright explained during an appearance on Fox News’s “The Sunday Briefing.”

He further elaborated that these tests are designed to assess various components of a nuclear weapon, ensuring they function correctly to initiate the nuclear explosion without actually detonating a nuclear device. Wright’s department is responsible for overseeing these tests.

Last week, President Trump took to social media to announce his directive for the Department of Defense to commence testing of U.S. nuclear weapons “on an equal basis,” which led to some confusion regarding the specific nature of these tests.

When pressed by reporters for further details, Trump did not specify whether his directive pertained to resuming actual nuclear explosive testing or was aimed at routine testing of delivery systems for nuclear weapons.

North Korea is the only country that has carried out nuclear testing since the 1990s. Russia has been conducting nuclear-capable weapons tests, which does not include setting off actual nuclear bombs. North Korean leader Kim Jong Un has been testing missiles capable of having nuclear warheads as recently as this week.

Wright, on Sunday, shot down a question on whether the testing is “something where people who live in the Nevada desert should expect to see a mushroom cloud at some point.”

“No, no worries about that,” he responded. “No worries about that.”

As the U.S. works to modernize its nuclear stockpile, Wright said officials will be testing the new systems, not the existing stockpile.

“The testing that we’ll be doing is on new systems. And again, these will be non-nuclear explosions. These are just developing these sophisticated systems so that our replacement nuclear weapons are even better than the ones they were before. They’re reliable in all circumstances, under all conditions, and they deliver the performance they were designed for,” he said.