Mueller expressed frustration the day after Attorney General Barr released summary of special counsel report

Special counsel Robert Mueller criticized Attorney General William Barr for Barr's summary to Congress about Mueller's work and investigative conclusions the day after that summary was released, according to a letter from Mueller released Wednesday.

Mueller sent an initial letter to Barr on March 25, the day after Barr said that Mueller had determined there was no collusion and that there was not enough of a case for the Justice Department to bring an obstruction case against the President.

The letter's disclosure Wednesday further raises questions about Barr's approach to...