If it’s internal to the WH, you likely wouldn’t get anyone to go on record. If it’s external to the WH you likely wouldn’t find anyone who would know, have personally seen or heard or wouldn’t have it beyond being 3rd, 4th or even deeper removed from the source.
well, we go back to Watergate and John Dean don’t we.
I think a reporter is setting him/herself up when they use only one source, particularly an unnamed one.
Unnamed sources don’t have to worry about blow-back if they lie.