Fox has been more anti-Trump than usual, esp. as of this weekend.
Fox and Murdock were exposed as anti-Trump in the NY Magazine article a few days ago. Murdock ordered Fox staffers to take Trump down August a year ago.
I don't watch Fox 24/7, so can't speak about all its people, but of those I do see, the vast majority are at least Trump-friendly and at worst "Fair & Balanced".
And I've seen no signs -- none, zero -- of some alleged recent anti-Trump surge at Fox.
Indeed, most of the Fox people I see seem to be quite pleased that Trump has now "tightened" the polls with Hillary.
Of course, you would expect any Republican or conservative to be very concerned about potential loss of majorities in Congress.
And if that loss results from fratricide amongst Republicans, it can go from "politics as usual" to real tragedy.
FYI, since the times of FDR and Truman, Arizona has consistently voted for Republican presidential candidates, with the one exception of Bill Clinton in 1996.
But Trump's obvious dislike for Arizonans McCain & Flake seems unlikely to excite enthusiasm for Trump amongst those Republicans who voted for their senators.