Adding safety for whom? For perhaps a dozen people? Maybe. For the other 300+ million? Not a bit.
When 2 of the 3 major US automakers of the time flew to congress in private jets begging for money, congress rightfully harassed them for wasting money. Yet we not only do the private jet thing for "vips", we setup a temporary air defense more significant than the one we had protecting Florida during the Cuban missile crisis. It's not just security theater, it's silly, expensive, and dangerous security theater.
Instead, let them fly coach, an old C-12, or in a big bus, like John Madden used to tour in.
Putting up a TFR for a VIP visit is like putting razor wire around a broken down filled in outhouse. And I mean the irrespective of administration or party.