The interviewer would like to avoid any hurdles during the offer and negotiations stage that would prevent you from being successfully on-boarded. If L3 Harris is a direct competitor to your current or most recent employer then you should carefully review your employment contract to ensure nothing is hindering you. Be prepared to present the agreement in your late stage interview.
If you are under a non-compete contract: "I am under a non-compete contract with Company ABC; however, it specifically states that I cannot share any trade secrets or recruit any of their current employees. There is nothing in the contract hindering me from joining L3 Harris."