Note that Corker does not inlude professional economists including those at CBO in the “many conversations” he claims to have had: He doesn’t want evidence and competent analysis any more than any of his colleagues; there are no, repeat no ‘moderate Republicans’ full stop.
If he had talked to someone genuinely competent* to comment on the subject he would have been told there is no evidence that tax cuts improve business productivity or competitiveness and his statement that this wretched excuse of a bill is a “once-in-a-generation opportunity to make U.S. businesses domestically more productive and internationally more competitive” is simply bullshit; just another talking point, bereft of real content.