Warmbier, a 22-year-old student at the University of Virginia, returned to his home OH last week in a comatose state after over 17 months of detention in North Korea, where he had been arrested for trying to steal a political propaganda sign.
"Bad things happened but at least we got him home to his parents".
He said that if Trump could resolve the North Korean nuclear issue as well as bring peace to the Korean Peninsula and overall greater security in northeastern Asia, it would probably be the US president's greatest diplomatic achievement.
Meanwhile, the travel agency that organized Warmbier's trip said it will no longer take US citizens to the north, calling the risk "too high".
He arrived in OH on June 13 after being held for more than 17 months.
The China-based travel agency that organized a trip to North Korea for an American college student who died after being released in a coma from North Korean detention said it would no longer take USA citizens to the country.
The University of Virginia student was medically evacuated from North Korea last week, more than a year after a court sentenced him to 15 years in prison with hard labor for allegedly trying to steal a propaganda banner.
The organizers of Warmbier's trip say they will no longer take USA citizens to the country. In the 17 months since Warmbier was taken, another two Americans have been detained, both in the airport under similar circumstances.
Tensions between the United States and North Korea have been heightened by dozens of North Korean missile launches and two nuclear bomb tests since previous year in defiance of U.N. Security Council resolutions.
Pneumonia, a blood clot, kidney failure or sepsis could have killed Otto Warmbier, but he nearly certainly never had a chance of recovering, neurologists said Monday.
Qatar calls on United Nations to protect Gulf citizens' rights
However, a few days later, the State Department insisted that the harsh economic sanctions are "hindering" the war effort. The June 5 announcement of the anti-Qatar blockade surprised the USA on several levels, officials said.
The brutality of North Korea's penal system, where even seemingly minor offences can result in a lengthy spell in one of the many labour and "re-education" camps, is no secret.
Legislation requiring Americans to obtain a license before visiting North Korea.
Warmbier's sophomore English teacher said he would be "dearly missed". "So I believe President Trump went much further than I did". "I hope that North Korea and the United States can properly handle the issue", Chinese Foreign Ministry spokesman Geng Shuang told the press.
Under their proposal, the Treasury Department would be ordered to prohibit all financial transactions related to travel to North Korea by Americans, unless specifically authorized by a USA license.
Trump spoke briefly about Warmbier during an Oval Office meeting with the president of Ukraine.
"We can not know for sure that North Korea killed Mr. Warmbier, but I believe it is quite clear that they have a heavy responsibility in the process that led to his death". "If there are any USA preconditions for the talks, the No. 1 priority has to be the release of the three other prisoners".
A team of United States doctors have also disputed North Korea's version of events.
Whether North Korea will actually respond to pressure or talks is unclear.
Warmbier's death affects South Korea's efforts to restart its dialogue with North Korea, Moon told CBS News' Norah O'Donnell, as "we must now have the perception that North Korea is an irrational regime".
North Korea is expected to top the agenda when United States and Chinese officials sit down in Washington, DC for a series of high-level diplomatic talks.