Since the assigned long shares are forced by the legal contract of the short put to allow the long put holder on the other side who forced the exercise to sell at that strike price, the broker can't even do anything about it if they wanted to, until the next trading day when the market opens.
If the broker was really worried about margin and never gave time for the trader to make a decision, which they should unless their dealing with dunces, they'd just sell the shares in the open market first chance in the morning next day. If the long shares incurred a loss, then they'd sell the long put too, which would more than make up for it since it would have increased in value due to the drop in value of the long shares, and also given the extra time premium value in the long put since it's sold before expiration, you would get more profit than you expected from the spread.
From what I've read and posted above from my broker, you have time to exercise if you want, but if your long put has time premium, it wouldn't make sense to do that, just sell it. If your long put was trading at a discount or at bogus levels, then exercising it is the best route and will offset any margin requirements going forward.
Sit down and write out the math yourself, you'll see that you're wrong, I've already given you the three possible scenarios after early expiration for american physicals above, and even if they're liquidated automatically the next morning, they all result in maximum profit.
Again, early assignment for debit spreads in equity options is a good thing, get that through your head. It means that you get maximum profit before expiration and can move on to other trades.
Have you ever even traded an option in your life?
If the broker was really worried about margin and never gave time for the trader to make a decision, which they should unless their dealing with dunces, they'd just sell the shares in the open market first chance in the morning next day. If the long shares incurred a loss, then they'd sell the long put too, which would more than make up for it since it would have increased in value due to the drop in value of the long shares, and also given the extra time premium value in the long put since it's sold before expiration, you would get more profit than you expected from the spread.
From what I've read and posted above from my broker, you have time to exercise if you want, but if your long put has time premium, it wouldn't make sense to do that, just sell it. If your long put was trading at a discount or at bogus levels, then exercising it is the best route and will offset any margin requirements going forward.
Sit down and write out the math yourself, you'll see that you're wrong, I've already given you the three possible scenarios after early expiration for american physicals above, and even if they're liquidated automatically the next morning, they all result in maximum profit.
Again, early assignment for debit spreads in equity options is a good thing, get that through your head. It means that you get maximum profit before expiration and can move on to other trades.
Have you ever even traded an option in your life?

so give it up...you ARE talking to a wall. No one who trades options gives a flying F what the guy thinks.