Is this really any different to Trump tweets or rallies? The travel ban is a perfect example. The words on the EO say one thing, his words say something different. Depending on what side you sit on you will choose the context that supports your agenda. The dems focused on his rallies, not the actual written words.
The FBI agent is never going to convince the republicans his rhetoric did not affect his judgement. I doubt most people would be convinced because there was so many anti-trump texts.
The dems would be best letting this go. I am surprised they have not focused more on the fact the email scandal was handled so poorly and in their view impacted HRC. Both dems and republicans need to get the perception of FBI fixed.