I think the importance of this cannot be understated. The Secretary of State is a nexus of not only extremely sensitive information, but of extremely sensitive

I think the importance of this cannot be understated. The Secretary of State is a nexus of not only extremely sensitive information, but of extremely sensitive information in motion which is also in overseas locations more often than not. If I were into tradecraft, I'd be much more likely to target the Secretary of State than the President for access to (relevant, valuable) sensitive information.