Trump claimed that "we have literally thousands and thousands of complaints coming in. ... So I think that Google and Twitter and Facebook, they're really treading on very, very troubled territory and they have to be careful."
Tria added that China's further reform and opening-up will unleash vast bilateral cooperation opportunities, and emphasized the two countries' shared vision to uphold globalization and underpin their ever-closer relations.
Trump's tariffs on the US' largest foreign providers of the crucial metals that went into effect on Friday upended the agenda for this normally convivial event for consensus-building among countries that account for about half of global GDP.
Trial operations are expected to begin in 2020.
Trump's action against the South American countries on Monday may be part of the continuing trade dispute between the US and China.
Trudeau urged Canadians to stay united and warned against the rise of prejudice as fears of the novel virus spread.
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Trump's 2016 campaign, citing unfair coverage, barred a number of outlets from officially covering its events, including BuzzFeed and Politico.
Trump had made repeated threats on the EU's car exports to the United States, and on Thursday he said "if they don't negotiate in good faith we'll do something having to do with all the millions of cars that are coming into our country and being taxed at a virtually zero level, at a very low level."
Trump said that the US side attaches great importance to its relations with China as well as to the US-China cooperation, and that it is willing to work with the Chinese side to enhance bilateral exchanges at all levels, expand pragmatic cooperation, and properly handle problems in bilateral trade so as to achieve even greater results in bilateral relations.
Treatment and prevention measures will be proposed before Jan 1, 2022, when the WHO's 11th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-11) comes into effect.