OReilly and Fox News for that matter have given Trump more coverage than all the shows combined. They’ve provided him a platform in which to speak and Oreilly above all was fair to him. He allowed him to speak at will and did ask tough questions. If we think Oreilly was unfair just wait until general and see what the media does to him
I never thought O’Reilly himself was unfair to Trump. Not really sure why anyone else would think so either, unless they’re grossly misperceiving the situation.
As far as other individual hosts, I thought Hannity was very fair, as well as Greta.
Fox News in general was often a different story though, and there were a few lengthy stretches of time where they were basically running wall-to-wall negative coverage of Trump. Hence part of the reason CNN of all things began to be considered as offering more fair coverage of the GOP primaries.