Trump said detaining asylum seekers while their cases are being decided would discourage others from following suit.
Trump will campaign every day leading up to Thursday's debate in Nashville, Tennessee, including stops in Arizona and North Carolina, campaign spokesman Tim Murtaugh said.
Trump opened the briefing by announcing that he will end preferential treatment for Hong Kong in trade and travel in response to a new security law pushed by Beijing.
Trump on Saturday proposed extending protections for young people brought to the nation illegally as children in exchange for the .7 billion funding for his long-promised border wall, signaling a willingness to break the shutdown standoff.
Trump has made immigration a signature issue of his presidency and of his re-election campaign. He declared a national emergency over the issue earlier this year in an effort to redirect funding from Congress to build a wall along the US southern border.
Trump expresses optimism about securing a deal in summit with Kim
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Trump stopped short of calling for a state of emergency, instead appealing to what he called the need to slash the cost to the government of the illegal drug trade, which he put at 0 billion a year, "vastly more than the .7 billion we have requested from Congress".
TuSimple, founded in 2015, currently operates self-driving trucks out of Tucson, Arizona. It is one of a number of start-ups developing technology aimed at making long-haul trucking cheaper and more efficient.
Tse also points out that, unlike in the United States, entrepreneurial opportunities are found throughout the country. "The mass innovation and entrepreneurship advocated by Premier Li Keqiang is spreading all over China. That is a major source of resilient growth. Beijing, Shenzhen and Hangzhou are really famous for innovation, but you get innovators all over, including in some of the smaller towns. Plus, they are spreading across a range of different sectors, not just one or two," he says.
Trump also claimed that none of the 50 governors in the country "need anything right now" to address new outbreaks.