But Tensing's attorney, Stew Mathews, said in November the shooting was justified as Tensing feared for his life and only fired to prevent being run over.
The first prosecution witness was a police supervisor who told jurors that Tensing purposely activated his camera to capture that video.
"He forgot and didn't use his training", she said.
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A spokesperson for Khan Sunday called Trump's remark "ill-informed" and said it took the mayor's words out of context . Twelve people who were arrested in Barking on Sunday in connection with the attack have been released without charge.
After opening statements, Tensing sighed, bit his lip and looked down several times while a video of the traffic stop captured by Tensing's body-worn camera played for the jury.
University of Cincinnati police officer Ray Tensing (R) stands near a vehicle after driver Samuel Dubose was allegedly pulled over and shot during a traffic stop in Cincinnati, Ohio, U.S. on July 19, 2015, in a still image from body camera video released by the Hamilton County Prosecutor's Office on July 29, 2015.
Jury selection in OH is moving more deliberately for the retrial than in the first trial of a white former police officer charged with murder in the 2015 death of a black unarmed motorist. Ray Tensing, center, and his defense attorney Stewart Mathews, right, listen to assistant prosecutor Stacey DeGraffenreid's opening statement during Tensing's retrial Thursday, June 8, 2017, at the Ha. DuBose did not comply and closed the door.
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Mrs Brownbill and daughter Hannah, 13, said they felt they had to attend to "support the people who weren't so lucky as us". Some attendees have admitted to feeling nervous following Saturday night's terror attack in central London.
The retrial judge has ruled that certain pieces of evidence presented in Tensing's first trial will not be admitted in the retrial.
There were six white men, four white women and two black women on that jury.
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The rally's name was a reference to Trump's remarks this week announcing his decision to pull out of the Paris climate accord. For many in the crowd, this was just the latest in a string of anti-Trump protests to unfold on the National Mall.