The "Russia investigation" refers to a series of inquiries initiated to examine potential interference by Russia in the 2016 United States presidential election. It focused on whether there were any connections between Donald Trump's campaign and Russian officials, as well as the impact of Russian disinformation campaigns on the election process. The investigation was led by Robert Mueller, who served as the special counsel. It resulted in a comprehensive report detailing findings on various individuals and entities, including indictments for some related to Russian interference. The investigation raised significant questions about election security and foreign influence in American politics.