International Desk: President Donald Trump has said the US has some "incredible" nuclear weapon systems that nobody knows about but refuted allegations of leaking classified information about them to a renowned investigative journalist in his upcoming book. The Washington Post said, "Woodward writes that anonymous people later confirmed that the US military had a secret new weapons system, but they would not provide details and that the people were surprised Trump had disclosed it". Trump denied having talked about classified information about US nuclear weapons. "We have great weaponry. No, I'm not talking about classified (information). I'm talking about what we build. We're building great weaponry," the president said when asked if he shared classified information about a nuclear weapons system with Woodward. "What were you talking about when you talked about that?" Trump was asked. "Our military is stronger now than it's ever been. We spent USD 2.5 trillion on our military over the last three-and-a-half years. We now have new rockets and missiles. And, frankly, our nuclear -- we have to hope to God we never have to use it -- but our nuclear now is in the best shape it's been in decades," he asserted. Trump told reporters the US has some nuclear systems that nobody knows about. "And, frankly, I think I'm better off keeping it that way. We have some incredible systems," he said. James Acton, co-director of the Carnegie Endowment for International Peace's nuclear policy programme, tweeted that Trump might have been mentioning a 2017 announcement of a plan to reduce the explosive power of some nuclear warheads on submarine-launched missiles. "The timing was kept secret. My guess is that Trump told Woodward about the first deployment before it was made public. This weapon is usually called the low-yield D5. The warhead is the W76-2," he tweeted. "I don't believe that the US could build an actually new nuclear weapon in secret. Too much money for classified budgets. Too many people involved for it not to leak, Acton said in another tweet. Meanwhile, addressing a public rally in Michigan, Trump asserted that he did not leak any information and asserted that he just wanted to inform the people that the US has the greatest weaponry in the world. "They (the media) said he may be giving away classified information. These people are sick. Never speak well about our technology...I just want to let people know we have the greatest systems, the greatest equipment, and the greatest people anywhere in the world. There is nobody like the US military," Trump told the crowd.