Sen. John McCain has warned President-elect Donald Trump’s team that Russia may “undermine democracy” if nothing is done about the Kremlin’s recent election meddling. In an interview with CNN aired Tuesday, McCain said more must be done about the CIA’s findings that the Kremlin interfered in the presidential election. “On the issue of the Russians, there is no doubt about it and we have to act and we have to have a policy—which this administration does not have—and address this threat to our national security,” he said. “If they’re able to undermine an election, they’re able then to undermine democracy,” he warned. Sen. Lindsey Graham echoed his concerns. “I think most of us, Democrats and Republicans, really believe that Russia is up to no good all over the world. They’re trying to break the back of democracies,” he said. While Trump has shrugged off the news of Russia’s involvement, McCain said he thinks “overwhelming evidence” would do the trick of getting Trump to change his stance on the matter. Rather than exercising caution with Russia, however, Trump has promised warmer relations with Moscow, praised Russian President Vladimir Putin, and filled his team with people who have strong Russia ties.