The Department of Homeland Security mounted an “inadequate” response to counter a Russian government-affiliated campaign preparing to undermine confidence in the American voting process, the Senate Intelligence Committee determined in an interim report released Tuesday detailing recommendations for how to improve election security across states and systems. The interim report, which identified at least 18, and potentially as many as 21 states whose election systems were targeted, is the first of four installments the committee is planning to release as part of its ongoing investigation into Russian interference during the 2016 elections, before concluding a final report in the fall that will address the greater themes of the investigation, including allegations of collusion between affiliates of President Donald Trump and Russian officials.