A lot of the democratic establishment used to have a close relationship with Trump and took his money often over the years. Then Biden even helped him get re-elected by all the lies and nonsense last year.
Things are not as they seem and the plan is clearly not for the establishment Democrats to stand up to Trump, they want him doing exactly what he's doing.
This is because behind the scenes, it really is a uniparty, and the only thing any of them really care about is money.
Political parties and disagreements are for the lower classes.