Prob. Code, § 19001

(a) Upon the death of a settlor, the property of the deceased settlor that was subject to the power of revocation at the time of the settlor’s death is subject to the claims of creditors of the deceased settlor’s probate estate and to the expenses of administration of the probate estate to the extent that the deceased settlor’s probate estate is inadequate to satisfy those claims and expenses.

(b) The deceased settlor, by appropriate direction in the trust instrument, may direct the priority of sources of payment of debts among subtrusts or other gifts established by the trust at the deceased settlor’s death. Notwithstanding this subdivision, no direction by the settlor shall alter the priority of payment, from whatever source, of the matters set forth in Section 11420 which shall be applied to the trust as it applies to a probate estate.