Operation Warp Speed Chief Adviser Dr. Moncef Slaoui has resigned at the request of the incoming Biden team, in a plan that would see him stay in the role for a month to help with the transition, CNBC reported on Tuesday.

The chief adviser for the US COVID-19 vaccine program, Slaoui's role leading vaccine development for the government effort is expected to be diminished after Jan. 20, CNBC said.