My parent's are in US on visitor VISA and they can stay here until August 20th, which is the end of six month.Since they are eligible, they are planning to apply for TPS status in couple of days. If the case is still pending until 20th of August (assuming it gets approved after this date) and they continue to stay here without applying for visitor visa extension, is this visitor visa still valid in the future upon TPS designation for Nepal is removed by USCIS. Their visa is valid until 2020 and I am aware the benefeciary will move back to previous status if USCIS does not renew TPS designation.