Yet another loss for the US administration as Kevin Sweeney, the chief of staff of the US Department of Defence, has announced his resignation.
This comes only after former Secretary of Defence Jim Mattis stepped down in December.
He is most likely to make a return to the private sector, as per some media reports.
Mattis, who worked with Sweeney when he led the US Central Command, picked him to be his chief of staff in early 2017.
Kevin Sweeney retired as a Rear Admiral from the US Navy in 2014.
Deputy Defence Secretary Patrick Shanahan is now Acting US Secretary of Defence.