I'm sure they will. S. Sanders, just the other day, may have, when stating the nature of advance notice the WH received re: the Stone arrest, used the peremptive variant of it: Not that I know of.
What makes her diction thus peremptive? The fact that, unlike some 325M other Americans, it's her job to know what the Dept. of Justice has communicated to the WH and what the WH has communicated to other units in the federal government, and it's her job to appear before the press fully informed.
I can't say her answer was untruthful, but in the context I'm here discussing, truth is but one germane aspect of the matter. Glibly forbearing her "I don't know" response is tantamount to forbearing a pool or beach's having employed a lifeguard who cannot swim.