President Trump continues to challenge his allies as well as his adversaries.

He withdrew the United States from the Paris agreement and resisted appeals from 19 other G20 leaders to reconsider. The final communique was the 19 versus 1 on climate change.

He talks again and again about renegotiating trade deals that are unfair to the United States and, at times, has threatened to walk away from them entirely.

He responded to Assad’s use of chemical weapons with a missile strike and has warned Kim Jong-Un of North Korea of very severe consequences if he continues to test long-range missiles that can carry nuclear warheads.

When other complain that he is shattering a consensus that took 70 years to build, Trump celebrates his disruptive behaviour.

In this, and in almost every other way, his foreign policy differs from that of his predecessor Barack Obama.

To help us evaluate Obama’s foreign policies, their strengths and their weaknesses, Janice spoke with Joe Klein, who recently wrote "Yes, He Did: Judging Obama’s Legacy" in Foreign Affairs. Klein is a columnist for Time magazine.