Update: Comey's testimony wrapped up around 11:40 a.m. central time. You can watch a replay here via C-SPAN.
Below is a live stream of Thursday's James Comey testimony, courtesy of NBC News. You can also click here to watch it on Twitter.
If the Twitter video link embedded above doesn't work, you can try C-SPAN's live coverage.
James Comey, who was director of the FBI for more than three years. He was fired by the Trump administration in May.
He will be testifying before the Senate Intelligence Committee. The hearing is high-profile and highly anticipated.
Critics, including most Minnesota Democrats and GOP Rep. Erik Paulsen, were very concerned about the timing, suggesting the president could have been obstructing further probing by letting Comey go. Comey reportedly has detailed records of conversations he had with President Trump, which are expected to be discussed at length Thursday.
You can get a sneak peek in this copy of his prepared testimony, released Wednesday. He'll read it today, then answer questions from the senators.
The actual hearing starts at about 9 a.m. central time, though some live streams will kick in earlier.
Capitol Hill, Washington D.C.