Perez didn’t identify any candidates he expected to run, though former Vice President Joe Biden, U.S. Sens. Kamala Harris and Cory Booker, and U.S. Rep. Tim Ryan have all been rumored to be considering a 2020 run. The Republicans in 2016 had 17 candidates, forcing underperforming candidates off the main stage and into a second-tier debate. A double-digit Democratic field would be a significant increase on the half-dozen Democrats who ran in 2016.