An important question.
I think the answer is, they want to remove President Trump through impeachment but don't want to get their hands dirty, lest it make their voters angry. Their comrades in the "Democratic" wing of the entity that rules over us understand their dilemma, and are more than happy to play "bad cop" to the congressional GOP's "good cop".
All the pieces are in place for a (perfectly legal) coup, as long as the corrupted Mueller investigation is allowed to run to completion.
Note that Paul Ryan, in his only passionate remarks so far about the "Russia" nonsense, vouched for Mueller's integrity and impartiality.
Ryan is the frontman for Romney and Bush, and is the key player in the conspiracy.
As soon as Mueller indicts Trump, a "shocked" Paul Ryan, "with a heavy heart", will announce that Trump has to go. All Ryan needs are 25 GOP votes (I presume all 193 Democrats are on board), and he surely has them in his pocket already.
Once Trump's trial in the Senate begins (if they even allow him the courtesy of a hearing), the 67 votes to remove him are certainly there. After all, the Democrats fear Trump but the Senate Republicans truly hate him - he stole their party, and they want it back.
Notice how Mueller is practically begging to be fired. I expect him to escalate his misbehavior after Labor Day. Either Trump allows himself and his whole family to be indicted, OR he saves Mueller the trouble by firing him - in either event, Ryan is now free to uncloak and issue the indictment the Senate is dying to receive.
The one way out (and I've been saying since January Trump had six months to do this, sorry DJT, time's up) is for Trump to renounce the Republican Party and announce that, since the Congress is unable to act in the American people's interest because of corruption that HE will personally designate 435 candidates for the House and 33 for the Senate in 2018 that will support his agenda.
This burns his bridges, and COULD lead to his removal - but it also would be such a potent threat that it could stay Ryan's (Romney's and Bush's) hand.
GRAHAM: ... Any effort to go after Mueller could be the beginning of the end of the Trump presidency, unless Mueller did something wrong.
Trump has yet to apply pressure to Mueller or Rosenstein. The justification for doing so is just recently emerged. Trump's legal team for doing so is recently formed.
The pieces for Ryan's coup attempt may be in place, but they haven't been "lit up" yet.
I think they under estimate POTUS. He is clearing out the rot. Priebus was the mole. McMaster will be next. The game changer will be the destruction DNC.
POTUS has the Intel, has the DNC laptops, and Wieners computer. There is also reason to believe Mueller is actually a Trump plant. Trump interviewed him for the FBI job the day before he was hired as the special prosecutor. The problem is Mueller is disqualified based on his prior tenure.
The arrest of the Awan brother was the lynchpin. As was predicted by an anonymous source on 4chan, July 27th begins “operation boomerang”. Get some popcorn, lots more to come.