Most of us have known for quite a while that class and honor are attributes that Donald Trump doesn't have. And he seems determined to prove that in his last few days in office. He continues to claim he won the election, even though all news outlets have declared Biden the winner (even Fox News).
Both by twitter (see above) and statements released (see below), Trump continues to lie. He is claiming that many of Biden's votes were illegal (fraudulent). But no election's division, in either a red or blue state, has claimed they found any kind of fraud.
Trump needs to concede, as presidents of both parties have done in the past, but his rampant narcissism won't allow that. He simply cannot admit he lost. But in refusing to do so, he is only hurting himself. History will not view this kindly.