In a strongly worded statement in February, Mr. Warmbier’s parents said that “Kim and his evil regime are responsible for the death of our son Otto.”
“We have been respectful during this summit process,” the Warmbiers said. “Now we must speak out.”
Efforts to reach Ms. Warmbier for further comment were unsuccessful Friday night. The White House did not respond to a request for comment.
In December 2015, Mr. Warmbier joined a five-day tour to North Korea with a Chinese company that advertised “budget travel to destinations your mother would rather you stayed away from.”
In early January 2016, he was arrested on charges related to trying to take down a propaganda poster in a hotel. He was sentenced to 15 years of prison and hard labor but fell into a coma during his detention. Mr. Warmbier spent 17 months in prison before being returned to the United States deaf, blind and unable to communicate.
In December, Mr. Warmbier’s parents were awarded a $501 million judgment after they sued North Korea in federal court over their son’s death, but it is unlikely they will ever see the money.
North Korea had apparently billed the Trump administration $2 million for Mr. Warmbier’s medical care, but Mr. Trump said in April the money was never paid.
“Had I known that North Korea wanted money for Otto, I would have gladly given them money from Day 1,” Ms. Warmbier said on Friday.