Further Aaron has always been straight and true, and though I don't know the precise legal arguments I suspect that expressing a desire to have a federally protected witness killed is probably actionable along the lines of expressing a wish to harm the President.
It matters not whether it was said emotionally or not, but if said in the presence of the Secret Service it must be investigated.
Her comments at the very least could be interpreted as a violation of Title 18, United States Code, Section 1512(a)(1)
, "Tampering with a witness, victim, or an informant":
§ 1512. Tampering with a witness, victim, or an informant
in the case of murder (as defined in section 1111), the death penalty or imprisonment for life, and in the case of any other killing, the punishment provided in section 1112
(1) Whoever kills or attempts to kill another person, with intent to—
(A) prevent the attendance or testimony of any person in an official proceeding;
(B) prevent the production of a record, document, or other object, in an official proceeding; or
(C) prevent the communication by any person to a law enforcement officer or judge of the United States of information relating to the commission or possible commission of a Federal offense or a violation of conditions of probation, parole, or release pending judicial proceedings;
shall be punished as provided in paragraph (3).
[ … ]
(3) The punishment for an offense under this subsection is—
(B) in the case of—
(i) an attempt to murder; or
(ii) the use or attempted use of physical force against any person; imprisonment for not more than 20 years; and
(C) in the case of the threat of use of physical force against any person, imprisonment for not more than 10 years
So this really is a great way to try and blackmail her given if convicted she'd be looking at 10 to life without even getting into the damage it would do to her Mother and her administration.
Or perhaps she'd be willing to just sleep with the guy like she did with the other reporter a few hours ago.
I could also see this discussion having been intercepted by the FBI for some reason (perhaps as a side effect of bringing the big nasty CTU servers back online) and Jack being forced to ask Aaron about it…