Rupert Murdoch owned News Corporation has donated $1m (£642,000) to the Republican Governors Association (RGA) in the US, to help its candidates in the November elections.
According to information given to the US Internal Revenue Service, the amount - one of the biggest donations to the party by any individual or company - was donated in June.
The move has invited criticism from various quarters, including the Democratic Governors Association (DGA). Democrats say such a high contribution from News Corp will cast a shadow on Murdoch's media properties, especially Fox News.
"For a media company - particularly one whose slogan is 'fair and balanced' - to be injecting themselves into the outcome of races is stunning," said Nathan Daschle, executive director of the DGA.
However, News Corp defended its move saying a corporate donation will not affect news gathering activities at Fox News.
Jack Horner, vice-president of corporate affairs and communications at News Corporation in New York, said: "News Corporation believes in the power of free markets and organisations like the RGA, which have a pro-business agenda, support our priorities at this most critical time for our economy."