The Secret Service has identified and thwarted approximately $1 billion worth of fraudulent claims seeking federal aid amid the coronavirus pandemic, a senior government official told lawmakers.

Michael D’Ambrosio, assistant director of the Secret Service’s Office of Investigations, testified before the Senate Judiciary Committee Tuesday that the agency has initiated more than 100 criminal investigations since the implementation of federal and state government aid programs were rolled out in March. People trying to defraud the government attempted to take roughly $1 billion of $3 trillion made available for U.S. citizens and businesses amid the economic recession brought on by nationwide closures.