The British prime minister says she intends to talk about the killing of Washington Post columnist Jamal Khashoggi with Saudi Crown Prince Mohammed bin Salman at the G-20 meeting in Argentina.

Theresa May said on the airplane to Buenos Aires that the British government “wants to see a full and transparent investigation in relation to what happened and obviously those responsible being held to account.”

The Guardian, a British newspaper, said Downing Street sources have not officially confirmed a bilateral meeting but have suggested that May and the crown prince would be “engaging.”

Khashoggi, a Saudi national and critic of the crown prince, was killed last month after entering the Saudi Arabian consulate in Istanbul, where he had gone to obtain documents needed for his upcoming wedding.

Saudi Arabia has denied allegations that Salman played a role in Khashoggi’s death, blaming the killing on rogue agents. U.S. President Donald Trump has echoed Riyadh’s denials and said the matter remains an open question.

South Carolina Republican Sen. Lindsey Graham, a frequent defender of Trump has joined other U.S. lawmakers in demanding a briefing by the CIA on Khashoggi’s death and has threatened to withhold votes on urgent legislation if it does not occur.