Washington (CNN) North Korea has invited President Donald Trump to meet their leader Kim Jong Un according to a senior US official and a former US senior official.

Trump told reporters Thursday that South Korea will make a "major announcement" concerning North Korea at 7 p.m. ET.

On Thursday a South Korean delegation came to the White House to brief officials on its most recent talks with North Korea -- the most significant talks between the two countries in more than a decade.

The South Korean officials visiting the White House on Thursday talked to Trump, a person familiar with the matter said.

They delivered a letter from Kim to Trump inviting him to meet, according to a senior US official and a former US senior official. A senior administration official later told reporters that the message and invitation from Kim to Trump was not in a physical letter, but conveyed "orally" by South Korea's Chung Eui-Yong.

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