Former Secretary of State John Kerry warned President Donald Trump Sunday that Democrats are not afraid to go against his “America First” policies.

“We won’t win, any of us, ultimately, by retreating within our borders, by focusing on our own nations only, or by going it alone,” Kerry told those gathered at New York University’s Abu Dhabi’s commencement ceremony Sunday — a direct reference to the president’s “America First” trade and immigration policies.

Kerry served as the secretary of state for former President Barack Obama. He also, notably, was one of the key negotiators for the administration when it was finalizing the Iran nuclear deal, which Trump backed out of on May 8.

Kerry lashed out against the president in early May for withdrawing from the deal, calling the administration out for stopping a “working” strategy.

American politics has become “almost all accusatory and all bombastic,” the former secretary of state told those gathered Sunday, arguing we are at the point where we can’t even “agree on what the facts are.”

“No matter how big or how many the challenges, I want you to leave here today confident about our ability to win that future,” Kerry said Sunday. “Every single problem we face is created by human choices. And to the best of my knowledge, those problems can also be solved by human choices.”

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