William Taylor, the acting U.S. ambassador to Ukraine, on Wednesday told members of the House Intelligence Committee that he had recently learned about a July 26 phone call between President Donald Trump and Gordon Sondland, the U.S. ambassador to the European Union.

Taylor told the committee that one of his aides asked Sondland after the phone call about the president’s thoughts on Ukraine. Sondland replied, “President Trump cares more about the investigations of [former Vice President Joe] Biden,” according to Taylor’s account of the aide’s conversation.

Trump said it was the first time he’d heard about it when asked by Fox News correspondent John Roberts.

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Taylor testified alongside George Kent, the deputy assistant secretary of State for European and Eurasian affairs, in the committee’s first public hearing in its impeachment inquiry into Trump.