Campaigners plan to ridicule the president, whose visit is deeply unpopular. LONDON — A 20-foot-tall inflatable orange baby with the face of President Donald Trump could float over Britain’s parliament next month, one of many acts of protest planned to coincide with Trump's first visit to the U.K. since taking office. Tens of thousands of demonstrators are expected to march in London, Scotland and elsewhere during his trip, which takes place amid a growing transatlantic trade war and global dismay at the treatment of immigrant families at the U.S. border. Britain is keen to reinforce its special relationship with Washington...