Trump told reporters at a White House Coronavirus Task Force news briefing that he does not intend to do so because different states have different levels of COVID-19 cases.
Trump suggested that the US will be meeting with the DPRK but has told Pyongyang it must first "denuke".
Trudeau's announcement came as the numbers of both new COVID-19 cases and deaths are rising across the country.
Trump, whose presence at the 2018 WEF was the first by a US head of state since former President Bill Clinton, said Thursday that Washington has "a great story to tell" at the international gathering this year, which runs on Jan. 22-25.
Trump is likely to visit China in November, when he also is set to attend the US-ASEAN summit and the East Asia summit in the Philippines, as well as the Asia-Pacific Economic Cooperation meeting in Vietnam, Reuters reported early on Tuesday, citing an unidentified US official.
Trudeau said that while the outlook is grim, Canada has the tools it needs to blunt the impact of a pandemic that has already infected over 145,000 people and claimed the lives of about 9,200 in this country.
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Trip sets stage for enhanced Belt, Road cooperation
Tsingtao Beer employees work on a production line in Xuanhua, Hebei province, on Aug 24. [Photo by Chen Xiaodong/For China Daily]
Trudeau also said: "You just watched his team's jaws drop to the floor." He explained Wednesday that was in reference to Trump's decision to hold the next Group of Seven meeting at Camp David, the presidential retreat.
Trump declined to say what Japan would have to do to avoid those tariffs but complained of an "unbelievably large" trade imbalance with the nation.