This is silly, Donald was absolutely sitting there with bated breath. For nearly 2 years he had disgraceful tantrums, whined literally more than a thousand times about it, personally attacked Mueller & his team. Called them a witch hunt. It's amusing as heck to see him changing his tune. Barr has done what Barr was hired to do, though he could not go as far as Donald wanted him to. Donald has lied when he's claimed that he's been exonerated. Barr wrote that the report did not exonerate him.
If Donald has been vindicated or exonerated by the report, he ought to be the 1st person to want that report to prove that. But instead he's having his sycophants block the resolution to make the report public.
To be completely honest if one removes their emotional feeling for Trump and how they feel about him they will see that there's ample reasons for why he fully deserved to be investigated. The Mueller investigation is merely one of about 17. He's already had multiple people from his orbit plead guilty to serious crimes, including his personal attorney & fixer. The entire attempt to try to undermine these hugely important facts has been coordinated through multiple platforms, corporations & political figures. It all forms into one big conglomeration: Donald First. Individuals want Trump out of office because he's disgraced that office & proven to be manifestly unqualified for it. That point needs to be understood and realized that it was a very real, based on reason rather than emotion or tribalism.