Oh wow! Obama had the same striped wall paper as Trump. Very unlikely it was changed in such a short time. See the pic here: https://i0.wp.com/www.mercurynews.com/wp-content/uploads/2017/08/ovaloffice2.jpg?w=620&crop=0%2C0px%2C100%2C9999px and here https://c8.alamy.com/comp/d9kt19/us-president-barack-obama-talks-with-senior-advisors-in-the-oval-office-d9kt19.jpg