In a stunning turn of events, Trump personally intervened into a security briefing intended for his top deputies, inviting the South Korean officials into the Oval Office where he agreed on the spot to a historic but exceedingly risky summit with North Korean dictator Kim Jong Un. He then orchestrated a dramatic public announcement on the driveway outside the West Wing broadcast live on cable networks.
Source: Trump wore all the hats in decision to meet with North Korean leader – Portland Press Herald