Former US President Donald Trump

Former US President Donald Trump

FILE PHOTO: US President Donald Trump walks down the West Wing colonnade from the Oval Office to the Rose Garden to deliver an update on the so-called "Operation Warp Speed" program, the joint Defense Department and HHS initiative that has struck deals with several drugmakers in an effort to help speed up the search for effective treatments for the ongoing coronavirus disease (COVID-19) pandemic, at the White House in Washington, U.S., November 13, 2020. REUTERS/Carlos Barria

Trump backtracks on acknowledging Biden won election, concedes 'nothing'

Trump made his conflicting statements in a series of Twitter posts