According to the wording it’s only supposed to be for children who murder someone under the auspices of terrorism. But I get the feeling the terrorism term will become the driving force for the imprisonments. Also, the condition where they can imprison children for 10 days if they are deemed to pose a threat is a really broad that is very prone to abuse.
I can see how the Saudis would be pretty happy about Trump coming in again. He and his family got pretty cozy with them the first time. And Trump is very hostile to Iran, who are Saudi Arabia’s main rival in that part of the Muslim world.