Special counsel Robert Mueller’s final report is said to be close to completion and ready for submission to the Justice Department. There is even conjecture that it is already finished, but Mueller decided, or was perhaps persuaded by newly confirmed Attorney General William Barr, to delay submission until President Trump returns from the Southeast Asia talks with North Korean strongman Kim Jong Un. In a perfect world, the final report would be a nonevent. Alas, that is not our world, so Mueller’s conclusion will be only the beginning of a free-for-all, featuring Washington hypocrisy at its worst. The special counsel has conducted a legal probe, but the Trump-Russia narrative has always been political, more about ramifications for 2020 than accountability for 2016. In that imaginary, perfect world, the Mueller report would be a nonevent for...