I see a man who is fed up with hyper-partisan radical left-wing propagandists masquerading as interviewers who are happy to let the most egregious lies slide when they interview Dems but literally cannot stop themselves from openly arguing with the opposing side.
Kristen, this is not rocket science. Ask your question, listen to the answer. Follow up ONCE, if needed. Then move to the next question. You are there to find out what Trump thinks, not to debate him.
Welker's professionalism is non-existent now. If it ever existed in the first place.