It is. It is highly doubtful that it will be allowed, however last year they made changes AFTER accepting returns. If it does change, and the deduction is allowed, you would need to file an amended return if the change resulted in a larger refund (or less tax due) and you wanted to take advantage of that.
If you end up taking the Standard Deduction and the addition amount of the mortgage insurance premiums would not change that, it would not make a difference.
