Mr. Barr dismissed Mr. Mueller's letter as “a bit snitty.” Democrats contended that Mr. Barr had been “purposely misleading” and had even lied to Congress. Republicans focused on what President Trump has called the actual scandal, the fact that he was investigated in the first place.

What Mueller wrote: In his March letter, Mr. Mueller expressed his and his team’s concerns that the attorney general had inadequately portrayed their conclusions. Pointedly, he attached the report’s executive summaries as a reminder that his investigators had already done the work of distilling their findings.

See for yourself: Read Mr. Mueller’s letter and review key moments from the testimony.

Next: Mr. Barr is expected to skip a House hearing on Thursday, after arguing with Democrats about its format. Democrats may subpoena him.