WASHINGTON (AP) — In a dramatic diplomatic turn, President Donald Trump on Thursday called off next month's summit with North Korea's Kim Jong Un, calling the cancellation a "tremendous setback" for peace and stressing that the US military was ready to respond to any "foolish or reckless acts" by the North. Trump first announced his decision in a letter to Kim released by the White House, in which he cited "tremendous anger and open hostility" in a recent statement by the North, adding that it was "inappropriate, at this time, to have this long-planned meeting." Speaking at the White House later, Trump said a "maximum pressure campaign" will continue against North Korea and that he was "waiting" should Kim choose to engage in "constructive" actions.