enforcement officer could neither constitutionally nor legally cute obstruction because that would amount to him obstructing himself. think ab and that he could, if he wished, terminate the inquiry or even he sdesired. pardon to power, if it's a similar argument to the one nixon famously made after leaving office. >> when the president does it, that means that it is not illegal. >> by definition? >> exactly. >> in introduce over the weekend, rudy giuliani, who joined the president's legal team after the letter was sent to mueller acknowledged the potential political consequences if the president were to pardon himself. >> president trump is not going to do that. he's obviously not going to give up any of his pardon powers or any other future president's pardon powers, but under these circumstances he is not going to do that. the president of the united states -- pardoning himself would just be unthinkable, and it would lead to probably an immediate impeachment.