"It's a total disgrace what happened to Otto", Trump told reporters in the White House, where he was meeting with Ukrainian President Petro Proshenko.
South Korean President Moon Jae-in says North Korea must bear "heavy responsibility" for the death of a 22-year-old US college student it detained for almost a year and a half. "And frankly, if he were brought home sooner, I think the results would have been a lot different".
North Korea has claimed Warmbier was in a comatose state for more than a year and asserted the US detainee was released last week on "humanitarian grounds".
"The very bad torturous mistreatment our son received at the hands of the North Koreans ensured that no other outcome was possible beyond the sad one we experienced today".
He was medically evacuated from North Korea last Tuesday and flown back to the USA where doctors at the University of Cincinnati medical centre treated him and concluded Warmbier had endured severe neurological injuries due to a cardiopulmonary arrest, and was in a state of "unresponsive wakefulness".
HIs father Fred Warmbier spoke after his release, he said: "There's no excuse for the way the North Koreans treated our son and the way they have treated so many others".
The death of an American college student who was held prisoner by North Korea has sent a chill through companies that organize tours to the secretive country.
The 22-year-old, who had suffered severe brain damage, was medically evacuated to the United States on June 13.
Bruce Klingner, a senior research fellow at the Heritage Foundation's Asian Studies Center, told CNN that the Trump administration isn't imposing secondary sanctions due to the "naïve belief that President Xi will do more than China has in the past", but it's time to stop holding back on China.
But American tourists make up only a small fraction of visitors to North Korea, whose tourism industry is dominated by visitors from China, its main economic partner.
The Trump administration doesn't need an act of Congress to bar Americans from traveling to North Korea.
Ruibal said that Warmbier extended himself to others.
There was no immediate word from Warmbier's family on the cause of his death. "Considering these facts and this tragic outcome we will no longer be organising tours for USA citizens to North Korea".
Many other USA officials have also expressed strong criticisms towards the hermit kingdom for its mistreatment of Warmbier.
The U.S. military said the bombers conducted two separate drills with the Japanese and South Korean air forces.
Calls for Moon to take a tougher approach to North Korea and stronger cooperation with the United States are growing in Seoul following Warmbier's death. North Korea accuses the United States of plotting with regional allies to topple its government.
The U.S. doesn't now prohibit its passports from being used to travel to any countries, even though financial restrictions limit U.S.travel to Cuba and elsewhere. "The U.S. government should not just throw up its hands and say, 'This is just how North Korea is.' But how do you do that in a smart way where there is some modicum of accountability?"
Warmbier's parents announced their son's death in a statement on Monday evening (19 June), saying that he had been subjected to "awful torturous mistreatment" adding they were glad he "completed his journey home". "It's a brutal regime and we'll be able to handle it".
Whether North Korea will actually respond to pressure or talks is unclear.