Two US small businesses on Friday challenged President Donald Trump’s latest round of tariffs on goods from 60 trading partners, saying that the new policy, like most of Trump’s previous tariffs, went beyond the president’s authority to tax imports. The lawsuit, filed in the US trade court in New York, argues that the new tariffs require more detailed country-specific findings about “forced labour” to be legally justified. The two small businesses, backed by a non-profit legal group that...