I would stop paying the rent .
The rental agreement is between you and the owner. The mortage is between the owner and the lender. He is not paying the bank so why pay him. The owner could try to evict you for non-payment of rent but that would cost him money so why would he do that if he is going to lose the property anyway.
Once the lender owns the property they will serve you an eviction notice. However, there are ways to delay your move out and live there rent free.
Check with a property management firm in your area or a real estate attorney. They have a better understanding of the eviction process in your area and the rights you have as a tenant.
All the best,