Murdoch's – and Fox's – support for open borders.

From 2016:

Well-concealed from virtually all reporting on Fox’s treatment of Trump is the fact that Murdoch is the co-chair of what is arguably one of the most powerful immigration lobbying firms in country, the Partnership for a New American Economy (PNAE).

In addition to blanketing the country, media, and politicians with literature, advertisements, and a barrage of lobbyists pushing for open border immigration policies, the Partnership for A New American Economy (PNAE) was a prime lobbyist for one of the biggest open borders pushes in American history: Marco Rubio’s 2013 Gang of Eight immigration bill.^[1]

Notes
^[1] "The Anti-Trump Network: Fox News Money Flows into Open Borders Group." By Julia Hahn, Breitbart, 1/20/16.