According to the Voice of America article, Director of National Intelligence James Clapper said Pyongyang has expanded the size of its Yongbyon uranium enrichment facility and restarted a reactor used for plutonium production.
In the report Clapper indicated that the North’s nuclear weapons and missile programs “pose a serious threat” to the U.S. and Asia, noting that Pyongyang is committed to “developing a missile that can strike the U.S. mainland.”
Clapper doesn’t apparently realize or understand that North Korea already possesses that capability. A fact confirmed by former President Bush in his book Decision Points.
See report: Former President Bush Confirmed North Korean nuclear strike capability https://groundreport.com/former-president-bush-confirms-north-koreas-nuclear-strike-capability/.
Concern revolves around North Korea’s North road-mobile intercontinental ballistic missiles, known as the KN-98. This missile is hard to target precisely because it is so mobile and being moved around constantly to avoid being targeted by the United States.