I think Obama has proved that a President can do whatever he wants as there is no mechanism to stop him save impeachment.
And when you control the Army and the DOJ, you can arrest members of Congress that might be plotting to impeach you.
All bets are off.
Do you seriously think that Trump with the support of the people is going to let the Washingtonians stop him from doing whats necessary?
He's going to DC to destroy the politicians, not act like one of them.
I think it is this attitude, seemingly shared by many Trump supporters, that scares me the most about a Trump candidacy. The attitude is, "Obama bypassed Congress, ignored the Constitution, enforced the laws he liked and ignored the ones he didn't; now see how you like it when Trump does the same! Unless you can get 67 votes to impeach, there's nothing you can do!"
The problem is, I actually want a president who knows and understands the Constitution and will follow it and the rule of law. I don't want another lawless president, even if this one might agree with me on some issues.
If we get another president who ignores the Constitution and rule of law like Obama, regardless of which party he/she represents, that will be the end of our Constitutional democracy. No president from that day forward will even worry about the Constitution, as the precedent will have been set and firmly established.