President and crown prince were both pressed on 2018 murder of Jamal Khashoggi by Saudi agents and protests of 9/11 victim families

The trip follows Trump's visit to Saudi Arabia in May in which the kingdom made a $600 billion trade and investment commitment to the U.S.

It is the first visit by Mohammed bin Salman to Washington since the 2018 murder of journalist critic Jamal Khashoggi