It all goes back to Trump's obsessions.
The thing that you've got to remember about Trump, bless his black heart, is that his obsessions invariably take him to places he would rather not have gone. In fact, the entire reason John Durham was ever appointed by Attorney General William Barr as a Special Counsel to look into the origins of Robert Mueller's Russia investigation in the first place had to do with Trump's obsessions. He was obsessed that the entire thing, which he famously and repeatedly called the Russia! Russia! Russia! witch hunt, was a plot by the FBI to get him. So, Trump had Barr appoint Durham to investigate the investigators. Put another way, Trump weaponized the Justice Department to pursue his perceived enemies in the FBI, beginning with his nemesis James Comey, the former head who first opened the investigation into the Trump campaign's ties to Russia way back in July of 2016.
