When was the last time you ever heard of a case where the defense didn't have adequate time to prepare for trial?
The last time I sat on a jury, I could tell from the docket number that the case had been filed three years earlier. The trial had probably been rescheduled at least a half-dozen times before they got to jury selection.
Normally you would be correct and there would be ample time. But this is a totally corrupt federal judicial system run by people who are themselves criminals, and their target is the one person who dares to take them on. When it comes to how the feds treat Donald Trump nothing works like it should, and his civil liberties don’t matter.
Another possibility is the feds want to get out front and say they were ready to go to trial while knowing a delay is likely. That might take away the argument that the corruptocracy waited until right before the election to take Trump to trial, and thus, interfere in the election.