A second U.S. embassy staffer in Kyiv overheard a key cellphone call between President Donald Trump and his ambassador to the European Union discussing the need for Ukrainian officials to pursue “investigations,” The Associated Press has learned.

The July 26 call between Trump and Gordon Sondland was first described during testimony Wednesday by William Taylor, the acting U.S. ambassador to Ukraine. Taylor said one of his staffers overhead the call while Sondland was in a restaurant the day after Trump’s July 25 call with Ukrainian President Volodymyr Zelenskiy that triggered the House impeachment inquiry.

The second diplomatic staffer also at the table was Suriya Jayanti, a foreign service officer based in Kyiv. A person briefed on what Jayanti overheard spoke to AP on condition of anonymity to discuss a matter under investigation.