Trump bought up to $500,000 of Boeing on the same day the Navy handed Boeing a deal worth up to $880 million

President Trump's portfolio investments are back in the spotlight after his accounts bought as much as $500,000 in Boeing (NYSE: BA) stock on the same day the aerospace giant secured a major contract with the U.S. Navy — an overlap that could renew questions about potential conflicts of interest involving the president's investments and his administration's decisions.