President Donald Trump said Thursday that it’s going to be difficult for him to concede the 2020 presidential election to Joe Biden even when the Electoral College is expected to soon formally certify Biden’s victory.

“It’s going to be a very hard thing to concede,” Trump told reporters on Thanksgiving evening as he took questions from the press for the first time since the election following a series of video conferences with military service members.

Pressed further about whether he would concede once the Electoral College finalizes Biden’s win, Trump said, “If they do, they’ve made a mistake.”