"Hillary Clinton Started To Cough Violently In Cleveland, Ohio," You Tube, CSpan video
Also on Sept. 5, speaking on her plane (before or after the Cleveland appearance): Video from Fox 10 Phoenix joins her remarks in progress. Less than a minute later she had to stop speaking, was overcome coughing:
9/5/16, "#HACKINGHILLARY AGAIN! This Time Coughing Fit Is On Her New Plane"
A few more random clips of Hillary in recent years exhibiting what seems to be chronic congestion in her lungs:
"Hillary Clinton Coughing Montage," You Tube, Jawanna Mann