Obstruction of justice allegations, of course, were what brought down Richard Nixon.
In a follow-up piece in New York magazine (link here), they focus on this revelation in the NBC piece: Mueller "appears to be interested in whether Trump directed [the former National Security Advisor Michael Flynn] to lie to senior officials, including Pence, or the FBI, and if so why."
Mueller has already flipped Flynn, who is now assisting prosecutors and could testify in any future criminal trial against anyone in Trump's circle of associates or even Trump himself. In order to offer him nearly complete immunity, Mueller had to receive something big from Flynn in return.
Offering up damning testimony against Trump himself would do that.
If this whole scenario plays out, it will be a reboot of Watergate. In that scandal, Nixon convinces subordinates to lie for him, but then they ultimately flipped and helped prosecutors make the case against Nixon.
One has to wonder why Trump didn't see Watergate as a cautionary tale and, instead, almost seemed to think it was an instruction manual.
If Trump ultimately is accused of the crime of obstruction of justice, what will Republicans in Congress to? IN Nixon's administration, they stood by him for a long time but ultimately abandoned him and that pushed Nixon into resignation. Could that happen again?