The release of Special Counsel Robert Mueller’s report has generated pitched debate over whether it vindicates President Donald Trump or damns him. But lost in this partisan fight is one of the investigation’s most important findings: its detailed documentation of Russia’s interference in the 2016 U.S. presidential election, which Mueller concluded was “sweeping and systematic.” If Democrats and Republicans cannot unite to take action against this threat to U.S. national security, they will leave Americans vulnerable to further attacks. Luckily, there are clear steps policymakers can take to secure American democracy—but they will require bipartisan leadership.