Trump's met with President Moon Jae-in at the Blue House, where the South Korean leader has his offices and home.
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Trump also met EXO, a star pop group whose members gave the president a book. The group also chatted with Trump's daughter, Ivanka, and his son-in-law, Jared Kushner.
The president isn't saying whether he'll meet North Korea's leader Kim Jong Un on Sunday at the heavily fortified South Korean-North Korean border known as the DMZ.
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Trump is just saying "it will be very interesting" but he's not giving other details about the surprise trip, which he announced earlier in the day on Twitter.