(CNN) The parents of Otto Warmbier, Fred and Cindy Warmbier, will have dinner at the White House on Saturday night with President Donald Trump and Richard Grenell, the US ambassador to Germany, according to two administration sources.

Otto Warmbier was an American college student who was held prisoner for 17 months by Pyongyang and died shortly after he was returned home in a comatose state in 2017.

It's unclear how Saturday's dinner was planned and whether anyone else will join them. A spokesman for the National Security Council did not provide a comment.

Grenell met with the Warmbiers when they visited Germany in August. He posted a photo of himself with Cindy Warmbier and his own mother on Instagram.