President Joe Biden handed Kamala Harris an opportunity to burnish her national profile when he directed a vice president with higher aspirations to forge a diplomatic solution to the migrant surge along the U.S.-Mexico border.

Biden last week announced Harris would lead the administration’s efforts to stem the flow of Central American migration at the southern border, the most prominent assignment yet for a vice president who has been looking to cement her role in the new administration. White House press secretary Jen Psaki on Tuesday struggled to list the vice president’s other four roles after Biden recently said she was leading or heavily involved in five major issues.