The Californian Democrat’s resignation comes two days before she becomes the first female vice president of the US, and the first person of colour to hold the office.
Harris notified Democratic Governor, Gavin Newsom that she will resign on Monday, January 18, her aide disclosed.
Her aide further said she has made calls regarding Retired Army Gen. Lloyd Austin’s nomination to be the next secretary of defence.
Austin is in need a waiver to lead the department as he has not been out of the military for the required seven years, and some Democrats on the Senate Armed Services Committee oppose granting the waiver, Vanguard reports.
Harris was elected into the Senate in 2016 but is now leaving the chamber two years ahead of her term expiration as she is set to resume her new role on Wednesday, January 20.
The Supreme Court Justice, Sonia Sotomayor will reportedly administer the oath of office to Harris on Wednesday.