But Mr. Hannity is not only Mr. Trump’s biggest media booster; he also veers into the role of adviser. Several people I’ve spoken with over the last couple of weeks said Mr. Hannity had for months peppered Mr. Trump, his family members and advisers with suggestions on strategy and messaging.

So involved is Mr. Hannity that three separate denizens of the hall of mirrors that is Trump World told me they believed Mr. Hannity was behaving as if he wanted a role in a possible Trump administration — something he denied to me as laughable and contractually prohibitive in an interview on Friday.

But he did not dispute that he lends his thoughts to Mr. Trump and others in his close orbit whom Mr. Hannity has known for years.

“Do I talk to my friend who I’ve known for years and speak my mind? I can’t not speak my mind,’’ he said…

But because Mr. Hannity is “not a journalist,” he apparently feels free to work in the full service of his candidate without having to abide by journalism’s general requirements for substantiation and prohibitions against, say, regularly sharing advice with political campaigns.