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 ClintonHillary Diane Rodham ClintonGraham: McCain 'acted appropriately' by handing Steele dossier to FBI Why Mueller's hedge on obstruction decision was a mistake Giuliani says news media treat Dems better than GOP MORE and former President Bill ClintonWilliam (Bill) Jefferson ClintonJam-packed primary poses a serious threat to Democrats in 2020 Will the Mueller report go public? The courts, not Barr, may ultimately decide Lessons from the 1999 U.S. military intervention in Kosovo MORE, tweeted.

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.

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.