I think you can fairly say that Gowdy failed to act. I think that Paul Ryan is more of a co-conspirator who refused to act. It was no oversight, he was working to take down Trump from day 1.
I loathe that lying, despicable backstabbing POS. He's even worse than Romney because he actually fooled many of us back when he was a nobody screaming for fiscal sanity and conservative principles (when he knew it would never happen). Lies, all lies. When he actually got real power we saw who he really was, a man untethered by principles with utter contempt for the electorate.
You can definitely see the impact of Paul Ryan being on the Board of Directors at Fox News.
And to think that I once thought that he was one of the Good Guys. Man, do I regret that!