People attending the Conservative Political Action Conference could be seen waving small Russian flags emblazoned with the word “Trump” during President Trump’s speech.

It appeared to be a prank. CPAC workers quickly began to collect the flags after they were being waved.

Snapchat’s Peter Hamby captured some of the action in a tweet:

Organizers told some attendees that anyone caught waving or holding the flags would be thrown out. 

An attendee from San Francisco told a reporter from The Hill that he didn't want to give up the flag, which he had sought to keep as a souvenir. The man also said that no one had a sense of humor any more.

Trump’s ties to Russia have dominated the news during his nascent presidency.

The intelligence community has concluded that Russia interfered in the presidential election to help Trump, and Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE’s Democratic campaign has blamed Moscow for her loss.

Just last week, Trump’s national security adviser, Michael Flynn, resigned after leaks about his own discussions with Russian officials.