A 2020 match-up between President Trump and fellow New Yorker Michael Bloomberg would make for “very, very competitive race,” former Trump campaign manager Corey Lewandowski said Wednesday.

Bloomberg is among the growing number of Democrats who are considering challenging Trump in the next presidential election. The billionaire former New York City mayor has pledged to spend $80 million to help elect congressional Democratic candidates in the fall midterm elections, and has reportedly told confidantes he’s weighing a White House bid after declining to run as an independent in 2016.