One of Trump’s biggest failures was an inability to weed out the weasels that were pernicious in DOJ Trump hated the swamp yet the swamp creatures found jobs in the administration.
His other shortcoming is he simply didn’t have a clue how government worked nor did he have the innate micromanaging skills to follow up on what he expected to be done.
There are essentially two kinds of business leaders; those who are big-picture showman and those who labor over every single detail. Trump was the former, not the latter in any way. If you give these career bureaucrats an inch, they really will take a mile. And they did, for four years.
I had no idea DC was that bad. Trump had no friends and attacked mercilessly his whole term.
President Trump was ever allowed to gain full control of the federal bureaucracy thanks to the Uniparty. After everything that's happened and a little bit of time for perspective on the past four years it's impossible to claim otherwise.