I think Trump trusts the IG to not protect domestic wrong doers. But "Sources and methods" Some of those are foreign "allies" (MI5/6, etc.).Not Identifying those will not necessarily harm the election. But they could-- Doh! clamhurt_legbeard said it well in his earlier post "What can the UK give us ...". Sorry, almost poached your post  accidentally. EDIT: Added "Not" typo