Open this photo in gallery: A man tests a laptop inside a Huawei store at a shopping mall in Beijing on April 13.PEDRO PARDO/AFP/Getty Images U.S. President Donald Trump is suggesting a separate set of tariffs on Chinese-made smartphones and other electronics could be announced as soon as Monday after granting exemptions for them just before the weekend, while his administration also prepares a new pharmaceutical tariff that could hammer Canada. The back-and-forth over a suite of China’s most significant exports to the U.S. has ramped up the uncertainty around the chaotic rollout of Mr. Trump’s on-again-off-again global tariff regime….