The bill was handed over to Joseph Yun, the former North Korean State Department Special Representative, who traveled to Pyongyang in June 2017 to bring Wormbyer home, CNN sources said.
Yun, who had orders from President Donald Trump to bring Walter home, signed the bill after informing Secretary of State Rex Tillerson. Then Tillerson told Trump about the bill, according to the source.
The Trump administration has not paid this bill, CNN reported on Thursday a source familiar with the issue, adding that North Korea has not raised the issue because it is trying to ease tensions with the US in 2018 to release three Americans in the same year, the source said.
"We make it clear that they will never get anything" when talks on the release of the three Americans are under way, the source added.
Earlier this month, during an event attended by Otto Wambiere's family, Pompeo rejected the idea of paying a ransom for hostages.
"Please do not forget that all the money for a terrorist or terrorist regime gives you money to be able to catch more than our people," he said. – We can not take that risk. You would not ask for this from us.
While the North Koreans did not submit the bill at Trump's summits with Kim Chen Un in Singapore and Vietnam, the source noted that expectations for this payment could be raised again.
This is especially true because the North Korean Foreign Ministry has an influence on the mass of the negotiations and they are the ones who hand over this bill to Yun, the source said.
Achieved by CNN on Thursday, Yun said he could not confirm the report because of the sensitive nature of the discussions.
"I can not confirm that," Yun said. "These are diplomatic exchanges and negotiations that I do not confirm."
"We are not commenting on the hostage negotiations, which is why they have been so successful during this administration," White House Secretary Sarah Sanders said in a written response to CNN.
The State Department refused to comment and mentioned Sanders' answer.
Warmbier was detained by North Korean officials in January 2016 as he tried to return to the United States on a tour of the country. On June 13, 2017, he was returned to his family "with severe brain damage and an unacceptable state" and died six days later.
Fred Wambiere, Otto's father, told the Washington Post that he did not know the bill in advance, but described it as a ransom for his deceased son.
"He tells me he did not know about it, and I will take him to his word," Trump said during a press conference, also claiming Kim feels very bad. But he knew the case very well, but he knew it later. "
These comments caused a gross reproach from the Warmbier family.
"We have had respect during this process at the summit, and now we have to talk about Kim and his evil regime being responsible for the death of our son Otto, thank you," said Fred and Cindy Wormby, Otto's parents, in a statement given to CNN .
Later, Trump examined the matter in Twitter, claiming he was "misinterpreted" after successfully leading Warmbier from North Korea and claiming to hold the country responsible for Warmbier's death, although he did not mention Kim's role.
"I never like to be misinterpreted, but especially when it's Otto Werbier and his big family," the president said. "Do not forget that I went with Otto along with three more people. The previous administration did nothing.
Devin Cole, Abby Philippe and Jennifer Hunsler from CNN contributed to this report.