So much has become clear:

During major inflection points in Donald J. Trump’s campaign, the advisers, family members and friends who make up his kitchen cabinet burn up their email accounts and phone lines gaming out how to get his candidacy on track (and what counsel he might go along with).

But one person in the mix brings more than just his political advice. He also happens to control an hour of prime time on the Fox News Channel.

That person is Sean Hannity.

Mr. Hannity uses his show on the nation’s most-watched cable news network to blare Mr. Trump’s message relentlessly — giving Mr. Trump the kind of promotional television exposure even a billionaire can’t afford for long.

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.

Note that this is not something that Hannity, for his part, denies (while he does deny that he wants a job in a potential Trump administration):

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.

This isn’t as bad as CNN employing a commentator who is contractually forbidden from criticizing Trump, but it is close.