US president Donald Trump took to Twitter on Sunday, May 5, 2019, to threaten China that he would increase tariffs from 10 to 25 per cent from Friday. Trump also tweeted that he was not satisfied with the pace of the trade negotiations. Trump made a similar threat in September last year but postponed a January 1, 2019, implementation after he and Chinese President Xi Jinping agreed on a tariff ceasefire and additional negotiations to end the trade war. Trump’s tweets promising tariffs on US…