President Donald Trump again praised Kim Jong Un for his rise to power on Sunday, describing him as a "pretty smart cookie" who had taken power from "some very tough people."

In comments made to CBS's Face the Nation on Sunday evening, Trump said he had "no idea" whether Kim Jong Un was sane, and said he was "not going to be very happy" if North Korea continued missile and nuclear tests. When asked if that meant military action was on the table, he replied: "we'll see."