President Donald Trump fired former FBI director James Comey while he was investigating the Trump Administration’s ties to Russia. Today (June 8) at 10 a.m. ET, Comey will testify before the Senate Select Committee on Intelligence about what happened, including conversations he had with Trump that suggest the president attempted to influence the investigation.

You can watch a livestream of the open hearing above, courtesy of Vox, and read Comey’s opening statement here. But first, read attorney and writer Seth Abramson’s Twitter thread on obstruction of justice, which breaks down what the committee is listening for in today’s proceedings.