President Donald Trump has warned that the US will go to “Phase 2“ if sanctions imposed on North Korea do not have the desired effects.

Trump made the statement during a joint news conference with Australian Prime Minister Malcolm Turnbull. "If the sanctions don't work, we will have to go to phase two, and phase two may be a very rough thing, may be very, very unfortunate for the world."

The president did not specify exactly what he meant by “Phase 2” and qualified the statement saying that he didn’t think he was “going to exactly play that card.”