.. But I talked to four legal experts—two former Justice Department officials, a former White House lawyer and a former U.S. attorney—who all agreed Mr. Trump has the rightful power, as head of the executive branch, to order the FBI to end any investigation.One expert raised this thought experiment: If President John F. Kennedy had ordered FBI Director J. Edgar Hoover to stop investigating Martin Luther King Jr., would that have constituted obstruction of justice?.. The statute that describes obstruction of justice speaks of “corrupt” conduct. Yet there is no evidence Mr. Trump acted with criminal purpose—for example, that he was bribed to shut down the Flynn investigation, or that he was trying to hide some personal financial interest in Mr. Flynn’s foreign lobbying... The president had better hope that Robert Mueller, the special counsel now looking into potential Russia-Trump ties, is nothing like Patrick Fitzgerald, the special counsel appointed in 2003 to investigate the leaking of a CIA official’s name to the columnist Robert Novak... But if Mr. Mueller turns out to be another Mr. Fitzgerald and finds no underlying offense, he may decide that he must still get someone for something, even over inconsequential differences of memory... The president better pray Robert Mueller is more responsible than Patrick Fitzgerald.