So the day Mueller resigns, he chooses to make a fairly brief statementputting a button on all of it, and at the same time declining to take any questions, before gliding back into private life.
But there's at least one comment Mueller made that nags at me. It's when he said, "If we had had confidence that the president clearly did not commit a crime, we would have said so."
Mueller must have had his reasons for shading his commentary in that way rather than in the other direction: If they'd found adequate evidence to implicate Trump in a crime, or even "collusion," they would have said that, too.
The statement Mueller chose to give carries with it an implication that his team looked for evidence of President Trump's innocence but simply could not find it.