This story sounds like a book in the making.
If you care at all, read the details in this article as to what happened,
"After President Nixon's scandals in the early 1970s, the Carter Administration imposed rules designed to prevent the FBI from meddling in politics, and to keep politicians from meddling in criminal investigations. In Bill Clinton’s first term, Attorney General Janet Reno limited contacts between the White House and law enforcement regarding criminal investigations to the top three officials at the Justice Department on the one hand and the President, Vice President and the top two White House lawyers on the other. George W. Bush loosened those limits after 9/11, but after a series of scandals, his last Attorney General, Michael Mukasey reimposed them. Those limits were again adopted by the Obama Administration in a 2009 memo by then-Attorney General Eric Holder.
Matt Miller, a Holder aide, says "that memo directs that contacts between the White House and the Justice Department be funneled through the White House counsel's office to the AG or Deputy Attorney General's office precisely so there can be no inappropriate tampering with investigations. If McCabe and Comey told Priebus about what was happening in an ongoing investigation into the president's associates, they clearly violated that guidance and crossed a major line."
FBI Broke Rules Talking to the White House About Russia | Time.com