Osama Bin Ladin's niece appeared at a protest during a meeting between US President Joe Biden and Russian president Vladimir Putin in Geneva on Wednesday, holding up a sign reading: "Trump Won".
Noor Bin Ladin, 34, was captured on video holding the banner on board a boat on Lake Geneva, outside the Biden-Putin summit.
The 9/11 mastermind's niece has expressed her support for former US President Donald Trump in the past and has repeatedly said she believes he won the 2020 election.
In videos of the protest, which were shared online, she can be seen holding up a banner as officers on a Swiss police boat speak to her.
"You're going to arrest me? If I don't give you the signs, you're going to arrest me?" she can be heard asking the officers.
"Donald Trump won the 2020 election, and we're not allowed here in Switzerland?"
In an interview she did later with the right-wing site InfoWars, bin Laden said the police confiscated her signs.
"I thought we were living in a free country, but apparently not," she said.
Trump lost a re-election bid last year to Biden, who was sworn in on 20 January. State and federal judges dismissed more than 50 lawsuits presented by Trump and his allies challenging the election and its outcome.
Judges concluded that there was no evidence of fraud and US election security officials said the election was "the most secure in American history".
Many took to Twitter this week to deride the incident and bin Laden's repeated support for Trump.
"The thing about reputation and association is, it encapsulates you. Noor coming to Trump's defense, ridicules Trump," another said.
It was not the first time bin Laden publicly supported Trump. In 2020, she endorsed the former president in an interview with The New York Post.
"I have been a supporter of President Trump since he announced he was running in the early days in 2015. I have watched from afar and I admire this man's resolve," she said at the time.
"He must be reelected... It's vital for the future of not only America, but Western civilisation as a whole."