The DOJ reportedly did not interfere with the Mueller investigation

Attorney General William Barr sent a letter to Congress on Friday, informing lawmakers that the investigation conducted by Special Counsel Robert Mueller had reached its conclusion and the final report is now under Barr's review.

The letter did not divulge much — indeed, Barr announced that he would brief Congress more thoroughly "as soon as this weekend." But one of the key pieces information about the process came to light precisely because it was not mentioned in the letter. Per special counsel investigation regulations, The Washington Post reports, Barr and Deputy Attorney General Rod Rosenstein were required to, first and foremost, alert Congress when the investigation was complete. Beyond that, the only requirement is to "provide a description and explanation" of any action by the special counsel that the Attorney General deemed "inappropriate or unwarranted."

Barr's initial letter, therefore, would indicate that the Department of Justice did not, over the course of the last two years, block Mueller and his team from investigating anyone. In other words, there does not appear to have been any executive interference.

"There were no such instances during the Special Counsel's Investigation," Barr wrote in the letter. Read the full analysis at The Washington Post.