May I approve a transaction with an excluded or disqualified person at a lower tier?

If a transaction at a lower tier is subject to your approval, you as an agency official may not approve— (a) A covered transaction with a person who is currently excluded, unless you obtain an exception under § 919.120; or (b) A transaction with a person who is disqualified from that transaction, unless you obtain a waiver or exception under the statute, Executive order, or regulation that is the basis for the person's disqualification.