Drum is just mad the original Whitewater investigation led nowhere, but eventually uncovered the fact Slick Willie obstructed justice and suborned perjury. He's being blatantly dishonest in this portion, though....
Donald Trump sure knows how to screw up, doesn’t he? He fired James Comey because the FBI was investigating Russia and he fired Preet Bharara because he was leading an investigation of money laundering.
Comey was fired because of his poor handling of the Clinton email case and making himself subject to questions of credibility by both sides.
Bharara was fired because he didn't resign - just like all the other US Attorneys when they were asked. Housecleaning is common at the change of administrations. Money laundering schemes are notoriously long and expensive to bring to trial. Settlements are common and it's likely Bharara would have as well. If you checked his prosecution history, I'm sure you will find this to be the case.