<P> The Judge Cuts rounds began airing on Tuesday , July 17 , 2018 . Like the previous season , one guest judge will join the judges ' panel each show and will be given one golden buzzer opportunity to send an act straight to the live shows . Eighteen acts perform each week instead of twenty as in the previous three seasons . Of the eighteen acts performing each week seven acts advance including the guest judge 's golden buzzer which immediately advances if used . Guest judges will not be given a red buzzer to use . Any act that will receive all four red buzzers will be immediately eliminated from the competition . The four guest judges are Ken Jeong , Olivia Munn , Martina McBride , and Chris Hardwick , who was also a guest judge in the previous season . The final Judge Cuts episode aired on August 7 , 2018 . This is the first Judge Cuts rounds in history where no acts received four red buzzers . </P>
who is guest judge on america got talent
Ken Jeong Olivia Munn Martina McBride Chris Hardwick