Can the SBA garnish a federal pension?

Several hurricanes ago I accepted a SBA loan, in my name only. My husband and I lost everything we owned in Hurricane Katrina, house, jobs, and a good sized piece of the lot we own. My husband recently received a letter from the SBA stating that they are preparing to garnish his pension (federal retirement)for my debt. I am in the process of filing for bankruptcy. Our sole income is my husband's federal pension. Can this garnishment be done? If so I guess I am about to be bankrupt and divorced!!!