Barclays has removed a senior member of its equities-trading team from his day-to-day responsibilities in the wake of allegations that his group lied to clients about the operations of its so-called dark pools, according to people familiar with the matter.

Bill White, head of the firm's Equities Electronic Trading operation, is focusing solely on answering questions related to the lawsuit, according to people familiar with Barclays' decision. White's group ran the trading platform known as Barclays LX.