tRump and his cronies don't investigate, they fabricate.
Not only is that statement false and opposite reality, but it exposes a problem for your party who is so corrupt and fascist in behavior that it believes this administration is not allowed to investigate corruption by questioning the foreign entities involved in colluding with that Dem corruption, however your party has no problem asking foreign entities questions about Trump and his cabinet and associates=double standard. Furthermore Pelosi is standing in front of a podium telling the corrupt media that her congress is doing their job investigating corruption when she's actually obstructing investigating corruption by her party members while only targeting her opponents for sake of manipulating elections, including using foreign actors and info to collude with foreign actors and agents against an opposition candidate= Collusion, abuse of Power, Treason, coup, maybe in some sense espionage by the Dems.
So Pelosi is not investigating corruption, they are the corruption and deflecting it and obstructing the real corruption investigation.
Remember BARR IS ALLOWED TO CONTACT FOREIGN NATIONS INVOLVED, but harassing him and trying to delay and use his time is=obstruction of Justice.
The president is required to stamp out corruption and when told by Barr to let countries involved know to cooperate with his investigation, then it is both the Sec. Of State and Presidents right to carry that out.
If you didn't have the whole Mueller probe open up this door then your party's skeletons would probably still be hidden. The fact Trump and the Country is allowed to defend itself against these abuses and treasonous acts means your denial of rights is further proof of a serious problem and fascist behavior by those supressing true investigations of true corruption.
Note Guilliani is an expert fighting mobsters and corruption, perfect for this task and that is why the state dept sent him in the lions den.
When treasonous politicians and media hosts and trolling forum posters blast Giuliani for being a patriot risking his life to erradicate corruption then ask yourself why you hate the national hero who cleans up mobster like behavior while you praise and supported pay to play Hillary and her sex offender
husband who in taking money from Saudis might have given a qid pro quo of letting Bin Laden slip away in 1998 thus inadvertantly leading to 9/11 all by and through this corruption, and greed and being politically compromised by said corruption those foreign parties can expose if you don't do their favors when asked.
That is where corruption and true qid pro quo can lead to thousands murdered and wars that lead to forming Isis, all through 1 single Saudis Sheik's envelope and favor.
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In conclusion you chose the mobster like instigators of 9/11 (Clintons) over the hero (Giuliani) of the aftermath who's always stood for eradicating mobsters and political corruption.
Just thought you'd need to self reflect on that, because you seem to have forgotten which side of evil you are on.