Yes, he can obtain child support as he clearly has custody of your daughter. You will need to seek an order for custody and visitation. You can modify the order giving him sole custody, the court continues to have jurisdiction to change the custody as long as your daughter is still a minor. The court, when hearing the request for child support, will not penalize him, or give him a lower amount of child support just because you argue that he keeps your daughter from you. He has apparently taken actions to enforce his right to financial assistance from you, you must now take action to enforce your rights as a parent to be involved with your daughter. The child support court will not help you with that, you need to file a separate action. If you attempt to discuss the custody and visitation with the court when you are there on the child support request, they will tell you it is "not before the court".