The U.S. may have relied on faulty intelligence when it came to the conclusion Russia was behind the hacking of Democratic groups and state voter registration servers, Russia’s ambassador to the U.S., Sergey Kislyak, said Tuesday.

“We have seen a number of statements by our colleagues in American intelligence on a number of issues that weren’t exactly true in history. I can give you a number of examples,” Kislyak said, according to a report in Buzzfeed of a discussion at the Johns Hopkins School of Advanced International Studies in Washington, D.C. Kislyak noted America’s mistaken belief that Iraq held weapons of mass destruction, and a recent U.S. strike on a Syrian Army position in Syria, which the U.S. later said was a mistake.