Just heard the same thing, on Fox Biz. Rep Duffy.
The White House confirmed that Trump would accept Kim’s invitation to meet.
“He will accept the invitation to meet with Kim Jong Un at a place and time to be determined,” White House press secretary Sarah Huckabee Sanders said. “We look forward to the denuclearization of North Korea. In the meantime, all sanctions and maximum pressure must remain.”
https://www.nbcnews.com/politics/white-house/south-koreans-deliver-letter-trump-kim-jong-un-n855051