The Energy Department says a small nuclear reactor under development at a national lab has reached a crucial milestone that could allow it to produce electricity in the next few years. The microreactor being developed by Antares Nuclear Inc. at the Idaho National Lab reached "criticality" on Thursday, Energy Secretary Chris Wright said. The milestone occurs when a nuclear reactor achieves a self-sustaining chain reaction capable of producing a steady release of energy. Antares is the first private company to bring an advanced reactor to criticality under a pilot program begun last year by the Trump administration.

Saudi Arabia could have some form of uranium enrichment within the kingdom under a proposed nuclear deal with the United States. That's according to congressional documents and an arms control group. Both U.S. Presidents Donald Trump and Joe Biden tried to reach a nuclear deal with the kingdom to share American technology. Nonproliferation experts warn any spinning centrifuges within Saudi Arabia could open the door to a possible weapons program for the kingdom. The kingdom's assertive crown prince has suggested he could pursue a nuclear weapon if Tehran obtains an atomic bomb.

President Donald Trump has declined to say whether he plans to resume underground nuclear detonation tests. He had seemed to suggest that was a possibility in a social media post this week. The post raised concerns the U.S. would begin testing nuclear weapons for the first time in three decades. The president told reporters, "You'll find out very soon" when he was asked about it. Trump said, "We're going to do some testing" and "Other countries do it. If they're going to do it, we're going to." But he refused to offer more details. He spoke aboard Air Force One as he headed to Florida on Friday for the weekend.