Trump also cited the South China Sea as among "threats to sovereignty" in his speech.
Trump appeared to be in a good mood for the upcoming talks. "Great to be in Singapore, excitement in the air!" he tweeted on Monday.
Trump's tariff threat has baffled US business leaders because it follows the recently announced US-Mexico-Canada Agreement and would complicate its ratification in Congress. Business leaders said tariffs would boost consumer prices and disrupt supply chains.
Trump has told confidants that he will declare victory on Tuesday night if it looks like he's "ahead," according to US news website Axios, citing three sources familiar with his private comments.
Trump received test for the coronavirus, also known as COVID-19, last week, and White House physician said on March 14 that the result was negative. Trump received Brazilian President Jair Bolsonaro and his entourage at his Mar-a-Lago estate in Florida earlier this month.
Trump tweeted Monday that he's waiting for Democrats to give votes "necessary for Border Security, including the Wall."
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Tricoire said the tangible development relating to the Belt and Road Initiative will become another highlight for China to further expand its market-opening channels, he said.
Trump has made addressing illegal immigration a key facet of his presidency.
Trump said on Friday he was considering extending penalties to an additional 7 billion of Chinese products. That would be on top of billion of goods already hit by 25 percent duties and another 0 billion on which Washington is poised to raise tariffs.
Trump's wife acknowledged the pain of the pandemic in sharp contrast to most other speakers at the party's national convention, notably her husband, assailed by Democrats for his lack of solace during a US health crisis that has killed more than 178,000 people.