Barr has assigned John. H. Durham, a respected career prosecutor and U.S. attorney in Connecticut, to find out. Also investigating is Michael Horowitz, inspector general of the Department of Justice. They’re pulling the threads of how all this started, with the FISA warrant application and who knew what about the former British intelligence officer Christopher Steele. He was the author of the Steele dossier, was on the Clinton political payroll and used Russian contacts to put a political case together against Trump, which was then leaked to the media.