As markets tanked in the wake of President Trump’s “Liberation Day” tariffs in early April, members of Congress and their families made hundreds of stock trades, shining a spotlight on a controversial practice that some lawmakers have pushed to ban. From April 2, when Trump launched sweeping tariffs, to April 8, the day before he paused many of them, more than a dozen House lawmakers and their family members made more than 700 stock trades, according to a Wall Street Journal analysis of...