Rep. Trey Gowdy, R-S.C. Sen. Chris Coons, D-Del. Sen. Tim Scott, R-S.C. Sen. Jeff Flake, R-Ariz., and Reps. Charlie Dent, R-Penn., Ileana Ros-Lehtinen, R-Fla., and Ed Royce, R-Calif. John Podesta, former Clinton campaign chairman David Hogg, Alex Wind, Emma Gonzalez, Cameron Kasky, and Jaclyn Corin