With many prominent Republicans ducking out of the GOP convention next month in Cleveland, presumptive presidential nominee Donald Trump has lined up a slew of sports figures and musicians to appear, including former Chicago Bears coach Mike Ditka.

Bloomberg on Tuesday reported that Trump campaign aides have lined up former world heavyweight champion Mike Tyson, Ditka, former Indiana University basketball coach Bobby Knight and NASCAR chief Brian France.

Bloomberg reports Trump aides are searching for other celebrities and top athletes to appear at the convention. Third-party groups have also booked musicians to perform at venues throughout Cleveland during the convention, including Journey, The Beach Boys, Bret Michaels, Rick Springfield, Martina McBride, Rascal Flatts and The Band Perry, according to the article.

Several local politicians have decided to skip the convention, including Illinois Governor Bruce Rauner. Sen. Mark Kirk and Illinois Comptroller Leslie Munger.