Earlier in the day, Comcast said it is in "advanced stages of preparing" a "superior" all-cash offer for the parts of Fox that Walt Disney has agreed to buy. However, Fox may find Comcast's bid less attractive since it would be taxable, versus a tax-free spin-off in a deal with Disney, sources told CNBC's David Faber.
Regardless, Hohn urged Murdoch in a letter, a copy of which was seen by CNBC, "to immediately engage" with Comcast. "The personal tax position of the Murdoch family must be an irrelevant consideration for the board, in order for the board to comply with their fiduciary duties," Hohn said.
Disney agreed in mid-December to acquire Fox's movie studios, the Nat Geo and FX networks, regional sports networks, stakes in Sky and Hulu and other parts of the company in a stock deal valued at about $66.1 billion.