If people are investigating you, to see if you had the intent to obstruct their legal investigation, the first thing you do is block everything they might want to see or hear, anything that could be used against you.
Did you launder money or knowingly do business with international criminals you may still be in business with? Block access to all of your financial transactions, particularly the shadier ones, like dealings with a bank that loaned you $40,000,000 to make a court-ordered $40,000,000 payment to that same bank. The second loan was given after you lost in your attempt to avoid repayment to that same bank using a wildly creative, legally implausible interpretation of force majeur (a natural disaster, an “act of God”, that can void a contract). source 
That’s why we have aggressive lawyers, to tie things up in court for as long as possible. If the buzzer goes off before the court rules against you– you win. That’s what winners do, win.
Did your lawyer speak under oath to federal prosecutors and say things that are very damaging? Perjury may be your only hope, smearing the guy as a perjurer, because the lawyer, and others, like your loyal personal assistant, gave sworn testimony that makes you look guilty of knowingly and deliberately obstructing justice. Their testimony, if truthful, goes to your clear intent to block the investigation. If they testify to Congress on television, your ass might well be cooked. Forbid them to testify by abusing a privilege that could take a year for a court to rule on! Meantime, call their credibility into question, along with their loyalty. Nobody the public hates more than a rat.
Are you accused of abusing the tremendous powers of your office? Double down. If they can’t prove you’re abusing the powers of your office before the buzzer goes off, you could skate on the whole abuse of power thing.
If your consigliere insists on following the law, say in the matter of recusal, which is triggered by the mere “appearance of impropriety”, humiliate the guy publicly in hopes that he will quit. If he doesn’t quit, as the heat is turned up on you, simply ask for his resignation. When he resigns, find more pliable, tough, ruthless hitmen to take a bullet for you. If you can find a really smart, loyal one with a history of having absolutely no shame, so much the better! You can ride out anything with someone who is a genius of playing out the clock and covering up evidence for decades!
Of course, you refuse to speak to investigators and answer all written questions “I don’t recall”. It turns out you can actually read a detailed recent example of this technique, employed by our current US president, here.
The main thing is never to cooperate with somebody with the power to hurt you. The world is dangerous, everyone can hurt you. Rule of thumb– don’t give an inch, to anyone, ever. What are they going to do, impeach you?
 from the Trump, Inc. episode linked above:
➧ Deutsche Bank’s private wealth unit loaned Trump $48 million — after he had defaulted on his $640 million loan and the bank’s commercial unit didn’t want to lend him any further funds — so that Trump could pay back another unit of Deutsche Bank. “No one has ever seen anything like it,” said David Enrich, finance editor of The New York Times, who is writing a book about the bank and spoke to Trump, Inc.