Washington (CNN) Former Vice President Joe Biden said Tuesday that democratic ideals are "under attack" and warned, "we have to resist the siren song of populism."

"We have to resist the siren song of populism and phony nationalism that threatens the north and south, including my home country. In fact, this is a global challenge," Biden said in Bogotá, Colombia, at the 2018 Concordia Americas Summit.

The remarks came one day after President Donald Trump met with Russian President Vladimir Putin and stunned the world by declining to endorse the US intelligence community's assessment that Russia interference in the 2016 presidential election.

"This is a moment where repressive regimes from Russia to China to Iran to Venezuela are weakening democratic forces in their societies and strengthening their grip on power," Biden said. "

"We're seeing democratic ideals that are the core of our identity, our regional identity, we see them under attack," he added. "If we fail to meet these challenges and defend our most basic ideals. If we fail to provide the leadership, the opportunities we've worked so hard to cultivate could slip away much more rapidly than we think."

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