Although it became crystal clear more than two weeks ago that Joe Biden had won the presidential election, Donald Trump and his administration have been blocking the start of the transition process by preventing communication with the incoming Biden team, blocking transition funding and resources, and prohibiting classified briefings.
Finally, after suffering more losses yesterday in court cases and failing to block state certifications, while more GOP officials recognized that Biden was the President-elect, Trump relented and allowed the transition to begin, all the while insisting he wasn't conceding and that he had won the election (details
here). Nevertheless, he still had to be pushed into making this move and only did so after at least three high-level administration officials said the transition had to begin.
Trump only has one appeal of any substance left, that of the withering beat-down he received last week in a Pennsylvania federal court from a Republican judge, and that's so legally contorted and absurd he has no chance of prevailing. Even if he did, however, he could flip no other state and still would be far short of the needed electoral majority.
Many political pundits doubt he will ever concede, but that does not matter. It only demonstrates that he's emotionally unfit to be president of anything, let alone the United States.
As a Republican Senator said in a statement urging the President to act before Trump finally allowed the transition to begin: "When you are in public life, people remember the last thing you do."