"What Does the President Owe, and to Whom Does He Owe It?"

"The counsel's mandate, however, only empowers him to investigate connections between Russia and the Trump campaign. It's by no means clear that he has authority to broaden the inquiry into the mighty question of why Russia chose to intervene, or to explore entanglements between the Russian government and Trump's businesses.
"People in Trump's orbit now face legal fees and legal jeopardy. For a long time however, the president himself will enjoy the shield of Robert Mueller's professional discretion.
"It doesn't have to be this way. Congress could still investigate itself or empower an independent investigation. This Congress won't. The next Congress should."

David Frum at The Atlantic wants more than a special council to investigate Donald Trump.