Almost all Americans who have gone to North Korea have left without incident.
"Why would I call China a currency manipulator when they are working with us on the North Korean problem", Trump wrote in April. "He hasn't had a full-blown press conference since February".
His comment could signal he is ready to play hardball with the Chinese, or at last send a message to China that the United States feels they are not coming to the table with a strong hand due to their continued trade with North Korea.
Warmbier was detained at the Pyongyang airport in January 2016, charged with a "hostile act" against the country's authoritarian government and convicted less than two months later of trying to steal a propaganda poster, after he delivered a tearful, televised confession, reports The New York Times.
One Trump administration official said bluntly they didn't know what Trump was referencing when asked what the tweet meant.
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"If people are that stupid that they still want to go to that country, then at least they assume the responsibility for their welfare", McCain said. "We don't know - and North Korea should come clean".
President Donald Trump said Tuesday that Warmbier's death after his lengthy detention in North Korea was a "total disgrace" and that if the college student had been returned home to the USA earlier, "I think the result would have been a lot different".
McCain, the chairman of the Armed Services Committee, said North Korea "murdered" Otto Warmbier, the 22-year-old American college student who died just days after North Korea released him from detention in a coma. He said the form would require Americans to affirm they're aware of what's transpired to other USA citizens, such as Warmbier, whom the senator said was "murdered" by the North.
The doctors said he had "extensive loss of brain tissue in all regions of his brain", most likely caused by cardiopulmonary arrest that cut off the blood supply to his brain.
Barring Americans from stepping foot in North Korea would mark the latest USA step to isolate the furtive, nuclear-armed nation, and protect US citizens who may be allured by the prospect of travelling there.
Tropical system moving toward Gulf Coast
Forecasters said the system will move inland by late Wednesday night or early Thursday, with slight strengthening possible. The storm, the first on record to form east of the Antilles in June, was moving west, northwest at 21 miles per hour .
This story has been corrected to show the coroner's last name is Sammarco, not Sammaraco. Three other USA citizens, including Kim, are still being held in North Korea.
Warmbier died in OH on Monday, days after being released by North Korea. Several senators said they were considering a travel ban. It said the flights demonstrated solidarity among South Korea, Japan and the United States "to defend against provocative and destabilizing actions in the Pacific theater".
Donald Trump condemned the "brutality" of Kim Jong-un's regime after Otto died. They did not cite a specific cause of death.
Warmbier was returned to OH on June 13 after being held for more than 17 months. His family said it was told he had been in a coma since soon after his sentencing.
South Korea to scrap all plans to build new nuclear reactors
A man watches the Seoul skyline covered with a thick haze at Seoul Tower's observation deck in Seoul , South Korea . The Kori-1 started commercial operations in 1978 with a lifespan of 30 years that was extended by a decade in 2007.
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