You think the US Senate is a firewall? They're part of the conspiracy.
Here's how the Senate and House want this to play out (so they can trick you, the voter)
They want to impeach the President with no due process, no opportunity to present a defense or call witnesses. Then the Senate wants to summarily dismiss the case so the President never has a chance to clear his name, present a defense or call witnesses. McConnell and Pelosi are doing this so the Dems can run on the stain of Impeachment and so they can make the argument that they need more power to impeach him again.
You think the Senate isn't in on this? The Senate is ALL IN on this.