US President Donald Trump speaks during a joint press conference with Colombia's President Juan Manuel Santos at the White House on May 18, 2017 in Washington, DC.
Trump denies asking Comey to stop Flynn probe
President Donald Trump said he did not ask FBI Director James Comey to end his investigation into Russia's involvement in the 2016 election and possible collusion with the Trump campaign.
1:45 • Source: CNN
James Comey kept memos 13 videos
US President Donald Trump speaks during a joint press conference with Colombia's President Juan Manuel Santos at the White House on May 18, 2017 in Washington, DC.
Trump denies asking Comey to stop Flynn probe
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FBI declines to hand over Comey memos
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WASHINGTON, DC - JANUARY 26: Upon returning from Philadelphia, President Donald Trump walks along the West Wing Colonnade on his way to the Oval Office at the White House, January 26, 2017 in Washington, DC. President Trump traveled to Philadelphia for the Joint GOP Issues Conference. (Photo by Drew Angerer/Getty Images)
Democrats and the "I" word
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The US Capitol building is pictured January 9, 2017 in Washington, DC.
Presidential impeachment 101: What to know
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US President Donald Trump waves as he walks towards Marine One while departing the White House on May 17, 2017 in Washington, DC en route to Connecticut. / AFP PHOTO / Olivier Douliery        (Photo credit should read OLIVIER DOULIERY/AFP/Getty Images)
Obstruction of justice difficult to prove
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WASHINGTON, DC - JANUARY 22: U.S. President Donald Trump (C) shakes hands with James Comey, director of the Federal Bureau of Investigation (FBI), during an Inaugural Law Enforcement Officers and First Responders Reception in the Blue Room of the White House on January 22, 2017 in Washington, DC. Trump today mocked protesters who gathered for large demonstrations across the U.S. and the world on Saturday to signal discontent with his leadership, but later offered a more conciliatory tone, saying he recognized such marches as a "hallmark of our democracy." (Photo by Andrew Harrer-Pool/Getty Images)
Sources: Trump asked to end Flynn investigation
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Rep. Jason Chaffetz, R-UT, speaks following the Republican nomination election for House speaker in the Longworth House Office Building on October 8, 2015 in Washington, DC. AFP PHOTO/MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Chaffetz: I'm ready to subpoena for Comey memo
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Cummings: Trump has stepped over the line
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Gergen: Trump is in impeachment territory
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Senator: Trump's request impeachable, if true
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Toobin: If true, it's obstruction of justice
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US Representative from California Adam Schiff, ranking member of the House Intelligence Committee, speaks to the press about the investigation of Russian meddling in the 2016 presidential election on Capitol Hill in Washington, DC, on March 24, 2017.
Schiff: Comey memo allegations disturbing
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NYT: Trump asked Comey to end Flynn inquiry
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