Authority: Kin Jong Un | Hereditary - President Trump | The People

Kim Jong Un is assuming that he has the authority to harm the USA.

Time will tell whether Kim Jong Un's assumption is correct

President Trump's responsibility is to protect and secure the US people.
Kim Jong Un is increasing his efforts.
President Trump has indicated that Kim Jong Un's behavior is unacceptable, and has communicated his concerns to Xi Jinping.
Xi Jinping has reacted favorably to President Trump.
President Truman made the decision to bomb Hiroshima and Nagasaki.
Time will tell what President Trump's reaction will be.