How can GOP senators serve as impeachment jurors when they're implicated in Trump's misdeeds?

https://www.salon.com/2019/10/30/how-can-gop-senators-serve-as-impeachment-jurors-when-theyre-implicated-in-trumps-misdeeds/
"Ron Johnson and Marsha Blackburn are tied to Russian money and Trump's conspiracy theories. They're not alone"