Chelsea Clinton early Sunday mocked President Trump after he referred to an incident in Sweden to defend his travel ban that left many Swedes confused.

“What happened in Sweden Friday night? Did they catch the Bowling Green Massacre perpetrators?” Clinton, the daughter of Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE and 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, tweeted.

What happened in Sweden Friday night? Did they catch the Bowling Green Massacre perpetrators? — Chelsea Clinton (@ChelseaClinton) February 19, 2017

At his campaign-style rally in Florida on Saturday, Trump pointed to incidents in Germany and Sweden as rationale for his executive order on immigration and refugees. Trump specifically pointed to an incident “last night” in Sweden.

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“When you look at what’s happening in Germany, when you look at what’s happening last night in Sweden — Sweden!" he said. "Who would believe this? Sweden! They took in large numbers, they’re having problems like they never thought possible.”

In her tweet, Chelsea Clinton referenced comments by Trump's senior adviser, Kellyanne Conway, who described a terrorist attack committed by two Iraqi refugees that never occurred — called the "Bowling Green Massacre" — during media interviews. Conway came under fire when she used the nonexistent event to defend Trump's travel ban.

Former Swedish Prime Minister Carl Bildt questioned Trump early Sunday.

“Sweden? Terror attack? What has he been smoking? Questions abound,” Bildt tweeted.

Sweden? Terror attack? What has he been smoking? Questions abound. https://t.co/XWgw8Fz7tj — Carl Bildt (@carlbildt) February 19, 2017

Trump did not elaborate, but some social media users pointed to a Fox News report on Friday that showed alleged violence committed by refugees in Sweden.

Social media users also mocked Trump over his comments, using the hashtags #LastNightInSweden and #SwedenIncident.