President Trump's supporters have a history of manufacturing story lines to undermine opponents. Is that what's going on with floating the possibility of firing special counsel Robert Mueller? Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Sens. Mark Warner, D-Va., and Richard Burr, R-N.C., lead the Senate Intelligence Committee, which is investigating Russian meddling in the 2016 presidential election. Tasos Katopodis/AFP/Getty Images hide caption

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Tasos Katopodis/AFP/Getty Images

Mark Warner (from left) of Virginia, the top Democrat on the Senate Intelligence Committee, and Republican Chairman Richard Burr of North Carolina listen to testimony during a March 30 hearing in Washington, D.C. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images

Sen. Mark Warner: No Evidence To Support Trump's Political Snooping Claims

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