Obama on Trump's Paris climate exit: It's difficult to defend

Seven years after leaving as White House chief of staff to President Barack Obama (in Oct. 2010), Chicago Mayor Rahm Emanuel introduced his former boss yesterday in the Windy City, at a summit on climate change that includes mayors from around the globe.

• Obama, via the Chicago Tribune: "This is my hometown, so I hope Rahm has been as good of a host as he was a chief of staff, and as good as he has been a mayor."
• Obama didn't mention Trump by name: "Obviously we're in an unusual time when the United States is now the only nation on earth that does not belong to the Paris agreement ... And that's a difficult position to defend. But the good news is that the Paris agreement was never going to solve the climate crisis on its own. It was going to be up to all of us."