Trump is not running for Senator. Regards Hillary I would imagine that if hubby Bill was with her then he would have been entitled to Secret Service protection but not her as SS protection (sounds vaguely sinister) is not granted to people running for Senatorial positions... so I guess there was some kind of in-fighting as to how the costs were allocated… I don’t know.
There is a law forbidding the use of taxpayer funded entities for private purposes. Doesn't matter what the office is.
https://www.justice.gov/jmd/misuse-position-and-government-resources
Remember when Trump said he would turn his enterprises over to the kids:
http://www.politico.com/story/2017/03/eric-trump-sharing-business-updates-father-236464
“I am deadly serious about that exercise,” he said. “I do not talk about the government with him, and he does not talk about the business with us. That’s kind of a steadfast pact we made, and it’s something that we honor.”
But nearly two minutes later, Trump admitted that he will keep his father up to speed on some aspects of the business.
“Yeah, on the bottom line, profitability reports and stuff like that, but you know, that’s about it,” he said, adding that the updates will be “probably quarterly.”
“My father and I are very close,” he said. “I talk to him a lot. We’re pretty inseparable.”
Trump and his White House have argued that the commander in chief is exempt from any conflicts of interest but that he handed over management of his company to fully focus on his administration.
Lawyers for the president have said the company won’t enter any new foreign deals and that any new domestic deals must be approved by an ethics adviser. Ethicists, however, have repeatedly criticized the arrangement, which they contend doesn't go far enough to separate the president from his massive business empire."