During his four years in office, former President Donald Trump wasn't just a rock star to his devoted MAGA base in the United States. He was a model for budding populists across Europe, says former Italian Prime Minister Enrico Letta. And now his sudden absence on the world stage presents real challenges for the populist leaders that hitched their ride to his wagon.

Letta spoke with Ian Bremmer on an episode of GZERO World, which began airing on US public television stations nationwide on Friday, March 26. Check local listings.

Watch the episode: Italy in Europe's spotlight: insights from former PM Enrico Letta

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