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The now viral FaceApp, which allows people to make themselves look old, could be a national security risk and the FBI must open an investigation into the app, according to a senior leader in the US Congress.

Investigators should work to understand the privacy and safety risks posed by the viral app, said US Senate minority leader Chuck Schumer.

The app could have put millions of citizens at risk, he said. He suggested that the fact the app is owned by a company based in Russia might mean that it being used for nefarious geopolitical ends.

“As FBI Director Wray himself pointed out earlier this year, Russia remains a significant counterintelligence threat,” he wrote in the letter. “It would be deeply troubling if the sensitive personal information of US citizens was provided to a hostile foreign power actively engaged in cyber hostilities against the United States.”

It comes as presidential candidates were instructed to delete the app immediately by Democrat security chief Bob Lord.

There is no evidence that FaceApp provides user data to the Russian government. While it is run out of Russia, FaceApp claims that no information about users’ photos is actually passed through servers in the country.