Actually, Sen Grassley is pretty much respected, around these parts, as being a good guy.
He’s sided with Trump on immigration and is one of the few Senators who has supported Cruz, in the past.
Here are a few threads to offer you some background on Sen Grassley...
http://www.freerepublic.com/focus/search?m=all;o=time;q=quick;s=chuck%20Grassley%20
I just see Grassley in lockstep with McConnell.
My recollection is that he ducked behind Mitch’s skirts when Cruz needed support for his filibuster.
He supports the ethanol subsidy - which is bad policy: Burn our food for fuel.