The first day of President Trump's impeachment trial in the Senate is today, marking just the third time a president has faced removal from office in U.S. history.
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The Senate begins the process with a debate of the rules and procedure for the Senate trial.
Senate Majority Leader Mitch McConnell's proposed rules for debate are facing a staunch challenge from Democrats.
Expect plenty of intense debate amid high partisan tensions.
Democrats are incensed with the rules proposal.
They say the plans prove that Republicans and the White House are continuing to "cover up" evidence of wrongdoing by the president.
Those rules could prevent key House evidence from being introduced and could lead to late night-early morning trial sessions as both House managers and lawyers for Mr. Trump lay out their cases.
There is also still the open question as to whether witnesses will be allowed to testify.