Former President Bill Clinton William (Bill) Jefferson ClintonD-Day for Trump: September 29 Trump job approval locked at 42 percent: Gallup If Trump doesn't know why he should be president again, how can voters? MORE on Thursday warned against the rising popularity of nationalism across the world.

“People who claim to want the nation-state are actually trying to have a pan-national movement to institutionalize separatism and division within borders all over the world,” Clinton said at a Brookings Institution event in Washington, D.C., according to Politico.

“It’s like we’re all having an identity crisis at once — and it is an inevitable consequence of the economic and social changes that have occurred at an increasingly rapid pace,” Clinton added, referencing recent political events in the Americas, Europe and the Philippines as examples.

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“And it always comes down to two things — are we going to live in an us and them world, or a world that we live in together? If you got that, in every age and time, the challenges we face can be resolved in a way to keep us going forward instead of taking us to the edge of destruction.”

Clinton did not mention President Trump in his remarks, his first public appearance since his wife, Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE, lost last year’s White House race to Trump.

Clinton delivered the keynote speech honoring former Israeli Prime Minister Yitzhak Rabin, who was assassinated in 1995 for negotiating a peace deal with Palestinians.

Bill Clinton added that Rabin was the opposite of the “us versus them” mentality that often governs global politics.

“The whole history of humankind is basically the definition of who is us and who is them, and the question of whether we should all live under the same set of rules,” he said.

“We are programmed biologically, instinctively, to prefer win-lose situations, us versus them. We have to find a way to bring simple, personal decency and trust back to our politics.”

Trump has repeatedly promised an “America First” policy at home and abroad, promising to focus on U.S. interests ahead of the nation’s role in the world community.