Former President Donald Trump and his allies have launched an investigation into claims that Joseph R. Biden Jr. was incapacitated and that his staff conspired to take presidential actions in his name. These allegations come as part of a broader effort by Trump’s team to challenge the legitimacy of Biden’s decisions, particularly those related to clemency. Biden’s administration, during his presidency, reportedly reduced the sentences of nearly 4,000 federal convicts and preemptively pardoned dozens of politically prominent individuals, many of whom were seen as potential targets for criminal investigations by his successor.