The announcement is going to be on North Korea, Trump told reporters as he popped into the White House briefing room unannounced for less than a minute.
"South Korea is going to make a major announcement at about 7 pm (0000 GMT/ 0530 IST)... On a big subject," Trump said smilingly.
Asked to specify if the announcement was on North Korea or trade, Trump said, "On North Korea,".
South Korean National Security Adviser Chung Eui-yong is currently visiting Washington to brief US allies about his recent landmark talks with North Korean leader Kim Jong Un in Pyongyang.
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