Crown Prince of Saudi Arabia
The two leaders were seen embracing one another warmly in Buenos Aires.
"Unless you speak Arabic, what are you going to get from it?" Trump's national security adviser said.
Mohammed bin Salman is under fire for his role in the murder of journalist Jamal Khashoggi.
The Saudi crown prince is visiting allies in the Middle East for the first time since the murder of the journalist.
WHAT'S HAPPENING
The day before, the president brushed aside the Saudi crown prince's alleged role in the murder of Jamal Khashoggi.
Prince Mohammed bin Salman, whose country doesn't recognize the right to religious freedom, had a two hour meeting with prominent evangelical leaders.
The Saudi story of how the Washington Post contributor was killed changes again.
The crown prince likely acted because he believed he had nothing to fear from the U.S., said John Sawers, former head of foreign intelligence.
Investigators are looking into the possibility that the missing journalist's remains may have been taken to a forest outside Istanbul or to another city.
It's clear that the Crown Prince was not afraid of any major repercussions when he delivered his chilling message to diaspora dissidents.