I just want to assure you that both President Bush and I have very firm alibis.

Climate change is real. The science is compelling. And the longer we wait, the harder the problem will be to solve.

When I was in Vietnam I learned a lot about the promises that soldiers make to each other. The Marines have a promise to never leave behind their dead. In this country, as citizen soldiers, we need to make the commitment to each other that we will never leave our veterans behind.

I can tell you, Massachusetts, fastest growing sector of our economy is clean energy and energy efficiency companies. And they're growing faster than any other sector.

I think as we celebrate the 70th anniversary of the UN, it's a good moment to rekindle our efforts to make multilateralism work yet again. And I'm proud to say that in the Iran agreement I think we did show that it can work.

Just the fact that we can't pass budgets in our Congress, just the fact that we are gridlocked in our own democracy, the fact that everybody who travels can see that we're not investing in our airports, in our rail, in our infrastructure and so forth, people are noticing a United States that is not getting the job done in some ways.

What Donald Trump is doing is serving the polluters and serving a narrow group of ideological interests. That's not leadership. That's abdication of responsibility, and this step does not make America first. It makes America last.