The dems want to get him in a perjury trap so they can get rid of him before he uncovers their treasonous actions....he knows it and is too smart for them...can you imagine what Brennan and Comey and Clapper and Obama and Hillary are thinking right now?....
Let's roll back a little. The job of the special prosecutor, or any other prosecutor is to complete the investigation and either ask the grand jury to return the indictment or decline to charge the case. When prosecutor decline to charge, they made that decision because they do not believe that investigated conduct constitute the crime, for which all the elements can be proven to the satisfaction of the jury beyond reasonable doubt.
Prosecutors are not in business of establishing the innocence, or exonerating investigated person. In our justice system innocence is presumed, and there is never need for the prosecutor to determine weather someone is innocent. On the contrary, prosecutors are in business of proving crime, and Mueller failed to prove that crime existed.
The president doesn't have to prove that he's innocent. He is presumed innocent until proven guilty, and Mueller investigation, as his report states, does not provide proof of collusion, or obstruction of justice. Our criminal justice does not have "exoneration" in its vocabulary, therefore the "exoneration" statements are simply political statements, and being political is not part of prosecutor duties.
About "perjury trap"... Pelosi, and others, called Barr a liar. They filed complaints with Maryland and Virginia bars to try to get AG Barr punished and disbarred, and they're talking about his impeachment. The goal is to discredit him enough to prevent his investigation into Democrats, FBI, and others interfering into our elections.
Democrats are completely out of control and they're trying to remove or impeach anybody who threatens their agenda, pretty much every Republican. At this moment, their biggest problem is AG Barr who openly said that he will investigate everything and everyone connected to spying on Trump campaign, including issuing FISA warrants, etc. Bottom line, Barr did not lie. He poked into hornet nest, and they don't like it at all.