In practice, presidents have typically tended to think of themselves not just as stewards for their party, but also of the presidency itself - preserving the full scope of its constitutional power for their successors is part of their job.

But I have to say, in my 12 years as the dean of admissions at Yale Law School, there was a lot of legal behaviour that I saw that worried me and that clearly was allowing wealthier and privileged students to tilt the balance in their favour.

Students come away with a clear message about how admissions works: If you have money, connections or 'insider' knowledge, you have a leg up. It's hardly surprising that many students of modest or lower means decide it's not even worth playing.

The president, by virtue of his office, can easily 'go dark' when it comes to conversations with foreign leaders, even if he makes promises or assurances that run contrary to the interests of the United States or even place the country in danger.

Russian President Vladimir Putin's traditionalist-nationalist rhetoric, which blames secularism, diversity and internationalism for the weakening of Western democracies, gives voice to the grievances that American hate groups have felt for so long.

As a former F.B.I. special agent who conducted counterintelligence investigations, I can attest that foreign intelligence services do not operate on the basis of explicit agreements or even actions that, standing alone, constitute criminal activity.

Unfortunately, once a person who is willing to act against the interests of the United States assumes the awesome powers of the presidency, the laws and investigative techniques we use in ordinary national security situations are woefully inadequate.

I know firsthand that it's difficult to get a FISA warrant. From 2002 to 2005, when I was an F.B.I. agent conducting counterintelligence investigations in New York, my FISA applications went through many layers of approval and required very strong evidence.

As a former FBI counterintelligence agent who investigated foreign propaganda cases, I've seen firsthand how foreign intelligence services leverage American freedoms - and the constitutional limitations on the FBI's investigative power - to their advantage.

Field offices are evaluated in part based on their success in following through on leads and making cases that result in arrests and convictions. No case agent worth their salt would remain quiet if their cases were closed in the face of a continuing threat.

Under the dual sovereignty principle, the Fifth Amendment's prohibition on double jeopardy - which prevents the government from trying someone twice for the same crime - doesn't apply if the second trial is by a different 'sovereign' - in this case, the state.

Presidents have, of course, acted inappropriately in the past, and our constitutional system has a framework in place for addressing misconduct by the chief executive. But it's designed to deal with straightforward criminal activity, not national security threats.

Trump has repeatedly insisted that he is innocent of colluding with Russia and had no idea about his campaign staff's Russia contacts. So he should be glad to know that the FBI appears to have been trying to thwart a hostile country's efforts to infiltrate his campaign.

Reflexive control is a 'uniquely Russian' technique of psychological manipulation through disinformation. The idea is to feed your adversary a set of assumptions that will produce a predictable response: That response, in turn, furthers a goal that advances your interests.

When it comes to the separation of powers, the Constitution makes it look pretty simple: Congress makes the laws, the president enforces them and the judiciary adjudicates them. In reality, though, the lines between the branches are a little blurrier than they seem on paper.

Originally, in fact, the power to pardon was used precisely for economic and political ends. Legal historians have noted that in England, kings used pardons for their own ends. For instance, criminals could be pardoned if they agreed to labor for the American colonies or the Crown's navy.

And, you know, in my opinion, when the FBI uses these sources, there are a lot of internal guidelines on how they can be used and particularly if they touch in any way on First Amendment activity. So you know, journalists, political activity, clergy people - all of those get extra special protection when it comes to FBI investigation.

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