After suspending his presidential campaign Monday, Sen. Cory Booker (D-NJ) shared his ‘concern’ over what would now be a Democratic debate stage with only white people, during an interview early Tuesday with “CBS This Morning.”

“I am very concerned. I still remember the reaction when Kamala Harris dropped off the stage amongst black women in my life. It was almost like ‘wait a minute’ ‘wait a minute.’ Here’s a woman that won in California twice… and she couldn’t even get to Iowa,” Sen. Booker said.

“How could we have a situation that is creating that kind of dynamic? We have got to find a way as a party, as a nation, both parties, to understand that we are a diverse nation.”

Tuesday night’s debate in Des Moines, Iowa comes ahead of the Iowa caucus on Feb. 3. Candidates set to take the stage include Vermont Sen. Bernie Sanders, Massachusetts Sen. Elizabeth Warren, South Bend, IN Mayor Pete Buttigieg, former Vice President Joe Biden, Minnesota Sen. Amy Klobuchar, and billionaire financier Tom Steyer.

Those still in the race that lack numbers to take to the stage Tuesday night include Silicon Valley businessman Andrew Yang, former New York City Mayor and billionaire Michael Bloomberg, former Massachusetts Governor Deval Patrick, California hedge-fund manager Tom Steyer, Colorado Sen. Michael Bennet, former Maryland Rep. John Delaney, Hawaii Rep. Tulsi Gabbard.