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Amid the spat, Trump pulled out of a joint communique with six other countries last weekend during a Quebec summit meeting of the Group of Seven rich nations and called Trudeau "very dishonest and weak."

Among other volunteers, Zhou has a longer history, since in past decades both his father and grandfather once also worked as volunteers in the city's fight against flooding.

Among the doctorate recipients in engineering in 2015, only 45 percent were US citizens and permanent residents, and nearly 55 percent went to temporary visa holders; similarly in mathematics and computer science, US citizens and permanent residents got only 43 percent and more than 50 percent were obtained by foreign students, according to data from the National Science Foundation.

Amazon’s announcement came two days after IBM said it would wind down its facial recognition products in response to the national racial justice movement. The ACLU is urging Microsoft to follow in IBM and Amazon’s footsteps.

Amazon’s new Echo Dot devices. (Amazon Photo)