 Because as the court points out, you're the head of the DOJ. There are only three branches of government, not four. The DOJ is not an independent branch of government. The Department of Justice works for the president of the United States. If the president orders the DOJ to go ahead and investigate a thing, it is the job of the DOJ to go ahead and investigate the thing. So that falls within his purview of authority. OK, so we'll get to how the actual ruling affects these various cases against Donald Trump.