Schumer Wants A Senate Investigation Of Trump's Call To Ukraine

Wait, whut? 
An investigation? Before impeaching/convicting?
WTF is this??? Due process or something?
Jesus. Yes, let's do this the old fashioned way, with an investigation and due process and a burden of proof and all that Eurocentric kind of thing. Let's even shoot for finding the truth, xenophobic and phallogocentric though that may be...
Honestly, it's like everybody's lost their minds. Doesn't anybody else want to know what realio-trulio actually happened?