US President Joe Biden is expected to name Jeff Zients, who ran the administration's response to the Covid-19 pandemic, as his next chief of staff.
Mr Biden's current top aide, Ron Klain, is preparing to leave the job in the coming weeks.
Since serving as Covid-19 response coordinator, Mr Zients has returned to the White House in a low-profile position to work on staffing matters for the remainder of Mr Biden's first term.
