The gop can gripe about Mueller's investigation costs when they

[Afromania]

2. The probes into the Clinton administration cost a tidy 80 mil.

So with the Muller investigation sitting at 3.2 mil and probably around 4 for a 8 months worth of work. He can go at it for another 20 years before closing in on the Clinton impeachment numbers. Further more as an aside, the Republicans spent 7 million and 28 months investigating Benghazi.

Muller has gotten FAR FAR FAR FAR FAR more done than either investigation and has done it a much shorter period of time. Dollar for dollar he's been far more efficient than either investigation. Oh, yea he's also doing it with the entire Republican party being in the negative numbers for the % of help they are lending to this thing.

So, in a nut shell Republicans can go find the nearest corner and go about shutting right the hell up.