Fox News remains a reliable supporter of the president, but the mogul’s WSJ has taken on Trump, triggering a legal battle.

President Donald Trump, 79, speculated on Tuesday whether Wall Street Journal owner Rupert Murdoch, 94, actually controlled the newspaper—one day after he demanded the 94-year-old be deposed in the $10 billion lawsuit he’s bringing against the paper.

Donald Trump is seeking an expedited deposition of Rupert Murdoch as part of his defamation litigation against the media titan and The Wall Street Journal.