When you've got the votes you can answer any question any damn way you choose and it has been that way for a long time. To the winner goes the spoils.
I attended the Senate Finance Committee hearings on the 1986 Tax Reform bill. An increase in capital gains rates was included in the proposed bill, so Sen Sims asked some IRS ******* why the projected revs from cap gains showed an increase when everybody in Washington knew that rate increases always cause a decrease in revs because people stop selling stuff. The mental giant gave him a blank stare then shrugged and said "Well, Senator, that's just an inherent part of our assumptions."