Former U.S. National Security Adviser John Bolton said on Wednesday that the United States should fully resume military exercises with South Korea to respond to North Korea's latest threats.

Bolton tweeted "How to respond to Kim Jong-un's threatening New Year's remarks? The U.S. should fully resume all canceled or down-sized military exercises in South Korea."

U.S. President Donald Trump's former security adviser also called for congressional hearings on whether American troops are truly ready to "fight tonight."

The tweet came after the North Korean leader said he saw no reason to continue his self-declared moratorium on nuclear and intercontinental ballistic missile tests and threatened to show a "new strategic weapon" in the near future.

Bolton, who left the White House last September following clashes with the president, has criticized the administration's nuclear negotiations with the North.