When the House votes Wednesday to send two articles of impeachment to the Senate, the rules of the upper chamber will suddenly change. All the procedural hallmarks normally associated with the Senate filibusters, cloture votes, and so on will disappear. A new and incredibly arcane process will control the impeachment trial of President Donald Trump .

Its a confusing process, and some rules wont be determined until the Senate votes on procedure in the coming days. Heres what we know about how it will go down.

Chief Justice John Roberts will oversee the trial, dictated by both long-standing Senate procedure and specific parameters for the Trump proceedings that will be set by Majority Leader Mitch McConnell (R-Ky.) and then approved by the Senate. That framework and the extent to which Roberts forces the body to adhere to certain rules will go a long way to determining how much the American public learns about Trumps efforts to withhold military aid to Ukraine in exchange for damaging information on his political rival, Joe Biden .

How It Will Start

The trial will begin after the House appoints impeachment managers, likely on Wednesday, who will then deliver the articles of impeachment to the Senate. The impeachment managers, chosen from current members of the House, will argue the case for the removal of the president before the Senate.

The Senate will send a summons to Chief Justice John Roberts to act as the presiding officer during the trial. Trump will also receive a summons, although he can, and will, send lawyers to represent him and argue against his impeachment.

The rules for the impeachment trial are written in a section of the Standing Rules of the Senate, which dictate all of the chambers proceedings. These rules were first written for the 1868 impeachment trial of President Andrew Johnson and then amended over the years during various judicial impeachments.

During the impeachment trial, almost every motion will only require a plain majority vote to pass a lower threshhold than the 60 needed to overcome a potential filibuster during many other Senate proceedings. The only time that a different vote total may be required is if Roberts rules that a motion would change the standing impeachment rules, which would trigger the need for a 67-vote supermajority.