LONDON — In a stunning retreat, Rupert Murdoch’s News Corp. media empire dropped its bid today to take over full control of British Sky Broadcasting amid a political and legal firestorm over phone hacking at one of its British newspapers.

Murdoch was forced to step back from the biggest battle of his career over a lucrative prize, accepting that he could not win government acceptance of the takeover as Britain’s major political parties had united against it.

“It has become clear that it is too difficult to progress in this climate,” News Corp. deputy chairman and president Chase Carey said in a brief statement to the London Stock Exchange.

Shares in BSkyB dived 4 percent lower after the announcement.

Hours earlier, Prime Minister David Cameron announced he was putting a senior judge in charge of an inquiry into phone hacking and alleged bribery by a tabloid newspaper, and vowed to investigate an allegation that a U.K. reporter may have sought the phone numbers of 9-11 victims in a quest for sensational scoops.