Kim had "committed to denuclearisation" and to suspending nuclear and missile tests, Chung said.
Last year, Sen. Hirono wrote to the president to urge him to fill the ambassadorship, and several other positions that are critical to finding a diplomatic solution to de-escalate tensions with North Korea.
U.S. President Donald Trump will not meet with North Korean leader Kim Jong-un unless he sees some "concrete" action by Pyongyang, the White House said on Friday.
The Paralympics began Friday as South Korea announced a grant of $120,000 to North Korea to support the participation of its team at the events which were scheduled to end on March 18.
"The President will not have the meeting without have concrete steps or seeing concrete actions taken by North Korea", she said.
Earlier Friday, Geng Shuang, a spokesman at China's Ministry of Foreign Affairs, described the development as positive and said it was a moment to show "political courage".
Asked whether the meeting might not take place "by May" as South Korea's national security adviser said Thursday, Sanders responded, "We haven't set a time or a location".
The meeting would be a first between a sitting USA president and a North Korean leader, offering a potential breakthrough in relations between the two adversaries.
Chung had recently returned from Pyongyang, where he met Kim who, he said, "expressed his eagerness to meet President Trump as soon as possible".
The White House's decision to follow through on the stunning announcement that Trump on Thursday accepted Kim's invitation for talks via South Korean officials will be made on the basis there are "concrete and verifiable steps".
Trump and Kim have repeatedly traded barbs in the past.
He also took credit for the recent rapprochement between the rival Koreas, as well as the USA, saying that without his "rhetoric and tough stance. they wouldn't be talking".
He also sought to draw a line between talks and negotiations, saying: "With respect to talks with North Korea versus negotiations - and I think this seems to be something that people continue to struggle with the difference - my comments have been that the conditions are not right for negotiations".
"There are a lot of potential exemptions, so I think safe haven flows into the yen have abated", said Roy Teo, investment strategist for LGT Bank in Singapore.
Secretary of State Rex Tillerson on Thursday said hours before Trump's agreement that the U.S. was still a long way from agreeing to direct talks. "And they have said that the goal is denuclearization, but they have not said that denuclearization will occur before this meeting takes place", Countryman said on CNN.
"Great progress being made but sanctions will remain until an agreement is reached", Trump said.