5 CFR 1650.3: Frozen accounts.

(a) All distributions from the TSP are subject to the rules relating to spousal rights (found in subpart G of this part) and to domestic relations orders, alimony and child support legal process, and child abuse enforcement orders (found in 5 CFR part 1653).

(b) A participant may not take a distribution of any portion of his or her account balance if the account is frozen due to a pending retirement benefits court order, an alimony or child support enforcement order, or a child abuse enforcement order, or because a freeze has been placed on the account by the TSP record keeper for another reason.