Leavitt, who has been described as one of the president's closest aides, has previously said that she will step down as press secretary at the end of the month for family reasons.
Several American media outlets are reporting that she will now return to a Trump-oriented fundraising organisation called Maga Inc., where she previously worked.
The organisation is a so-called "super PAC" that is allowed to raise unlimited amounts of money that can be used to support political candidates.
