The idea is to stonewall until POOTUS is out of office
Except that unlike Congress, you DO NOT stonewall a Federal judge, ESPECIALLY THIS Federal judge.
He's the one that nailed the hides of several Federal Attorneys to the wall a couple of years ago.
They were the ones who filed politically motivated charges against the Alaska Senator RIGHT before an election and cost him his seat.
The judge wasn't having any and they would up disbarred as I recall.
Federal judges have great powers, including subpoenas and search warrants, plus the power to appoint special prosecutors.
Fail to produce documents he demands, and you find US Marshalls putting you in cuffs.
If Congress demands documents and they fail to produce, Congress has to find them in contempt, then hand it over to Holder to prosecute. Of course Holder does nothing.
A Federal judge doesn't have to deal with the Justice Department or Holder, he can issue arrest warrants and search warrants.
He's well known as a honest, no-fear judge who has the power to appoint a special prosecutor, and he's well known for picking them with great care to insure they're effective men who don't get side tracked or blown off.
He has the IRS and the White House scared to death because he does have the power to appoint a special prosecutor, and because he won't and can't be deterred.
Remember the smirky, insolent faces and attitudes of the IRS people in front of congress, with that "How DARE you call ME in here like this"?
Try that in front of this judge and they'll suddenly notice the US Marshall bailiff putting the cuffs on so they can spend a while in jail for contempt.
The IRS and White House's greatest fear has always been an effective judge and/or Special Prosecutor with the power to dig out the truth and the authority not to be deterred.
You'll note that after years or blowing Congress off, the FIRST day before this judge he laid some law on them and ordered that documents be produced in 30 days.
Not said but VERY clear is an "or else".