WASHINGTON (AP) — President Donald Trump’s legal team is evaluating potential conflicts of interest among members of special counsel Robert Mueller’s investigative team, three people with knowledge of the matter said Thursday. The revelations come as Mueller’s investigation appears likely to probe some of the Trump family’s business ties.

Attorney Jay Sekulow, a member of the president’s external legal team, told The Associated Press that the lawyers “will consistently evaluate the issue of conflicts and raise them in the appropriate venue.”

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Two people with knowledge of that process say those efforts include probing the political affiliations of Mueller’s investigators and their past work history. Trump himself has publicly challenged Mueller, declaring this week that the former FBI director would be crossing a line if he investigated the president’s personal business ties.

Mueller and congressional committees are investigating whether the president’s campaign coordinated with Russia during the 2016 election. While Trump has assailed the probes as a partisan “witch hunt,” the investigations have increasingly ensnared his family and close advisers, including son Donald Trump Jr. and son-in-law and White House senior adviser Jared Kushner.

As the investigations intensify, Trump’s legal team is also undergoing a shakeup. New York-based attorney Marc Kasowitz, whose unconventional style has irked some White House aides, is seen as a diminishing presence in the operation, according to two people with knowledge of the matter.

Mark Corallo, who has been working as a spokesman for the legal team, is no longer part of the operation, according to those familiar with the situation. They insisted on anonymity because they were not authorized to discuss the matter publicly.