All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
If a person has debts and he has no money to repay his debts and to perform Hajj, then he is not considered as having the financial ability, which is a condition for Hajj to become an obligation (on a person). The financial ability for a person is to find a suitable means which will take him to Hajj after having fulfilled his obligations, legal expenses, and basic needs. Among fulfilling the obligations, a person should repay his debts.
Therefore, your husband is not obliged to perform Hajj according to his circumstances which you mentioned in the question. Furthermore, he is obliged to give priority to the immediate debts and obligatory expenses over performing Hajj.
Allaah Knows best.