Ballots are still being counted in Pennsylvania’s Republican Senate primary between Dr. Mehmet Oz and David McCormick. The final outcome is delayed partly because of a printing error in Lancaster County that has left about 22,000 ballots unable to be read by scanners. CNN Chief National Correspondent and anchor of Inside Politics John King joins AC360 to give an update on the race and when he thinks we’ll know the winner.

Plus, the suspect in the Buffalo supermarket shooting posted about his attack plans thirty minutes before he allegedly killed 10 people and injured another three. Ruth Whitfield stopped at the grocery store after visiting her husband, who is in a nursing home, and never made it out alive. Her son, Garnell Whitefield Jr., tells Anderson Cooper about his mother and says she loved her family “unconditionally.”

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