U.S. President Joe Biden expressed disagreement with Saudi Arabia over the bilateral summit’s discussions of the killing of journalist Jamal Khashoggi in 2018—a major point of contention between the two countries.

Biden disputed the Saudi foreign minister’s claim that he did not hear Biden blame Saudi Crown Prince Mohammed bin Salman for the killing of the Washington Post columnist, a harsh critic of his native Saudi Arabia, in remarks to reporters as he arrived at the White House following his first Middle East trip as president.

Asked whether the minister of state for foreign affairs, Adel al-Jubeir, was telling the truth in recounting the exchange between Biden and the crown prince, the president said “No”.

U.S. intelligence agencies believe the crown prince ordered the killing of Khashoggi, a U.S. citizen, which the de facto Saudi ruler denies.

Jubeir said the crown prince, known as MbS, had told Biden the kingdom had acted to prevent a repeat of mistakes like Khashoggi’s killing and that the United States had also made mistakes.

The minister told Fox News on Saturday that he “didn’t hear that particular phrase” from Biden blaming the crown prince.

Biden, asked whether he regretted exchanging a first bump with MbS on Friday, replied: “Why don’t you guys talk about something that matters? I’m happy to answer a question that matters.”