Canada could face a surge of new cases of COVID-19 later this year.
South Korea says they have "nothing to confirm" regarding the 36-year-old's health.
Kim criticized the White House for pushing the narrative that North Korea had chosen to denuclearize because of U.S. sanctions and pressure.
Kim has expressed an "eagerness to meet" with Trump.
The 2018 Ski Robot Challenge is being held 40 kilometres southwest of Pyeongchang.
The local price of bitcoin plunged as much as 21 percent in midday trade.
Representatives from Seoul also said they hope the North will walk with the South under a joint flag during opening and closing ceremonies.
Trump was responding to comments made by North Korean leader Kim Jong Un.
A group of scientists said such a missile could reach Washington.
The president is conferring with other world leaders.