Kamala Harris is reportedly focusing on ways to rattle Donald Trump as she prepares for their Sept. 10 presidential debate.Harris' team views the optics of her face-off with the former president as crucial, according to sources close to the vice president, one of whom told NBC News her campaign wants to remind people of what it was like during Donald Trump's years.Of the issues she is likely to address, Harris is expected to drill the former president on his role in Republicans backing out of