Wilmington, Delaware CNN —The judge in the Dominion Voting Systems’ defamation case against Fox News signaled his interest Wednesday in the duty that executives like Rupert Murdoch might have to stop known liars from going on-air, and suggested he might force Murdoch to testify. Delaware Superior Court Judge Eric Davis repeatedly pressed a Fox News lawyer about the role of top executives in the editorial process. His questions dovetailed with Dominion’s claim that Murdoch knowingly let Fox News hosts book guests that would lie about the 2020 election. The voting systems company wants Davis to force Murdoch and his son, Fox Corporation CEO Lachlan Murdoch, to testify at trial, which is set to begin next month. Other internal Fox emails revealed that Rupert Murdoch thought Trump lost the election fair and square, and never believed the Dominion-related conspiracy theories.