President Donald Trump has issued a pardon to Stephen Buyer, a former Republican congressman from Indiana who served nearly two years in prison for making illegal stock trades based on inside information after he left office.

President Trump granted a pardon this week to a former Republican lawmaker who was convicted of insider trading for using nonpublic information to buy stocks after leaving office, according to the White House. A June 4 proclamation stated that ex-Rep. Stephen Buyer (R-Ind.) would receive a “full, complete, and unconditional pardon” without explanation. It notes...