tyb
You are correct that there was a 53-47 vote on the SA arms deal.
https://www.businessinsider.com/saudi-arabia-arms-deal-senate-vote-2017-6
However, that vote took place in June.
Q's reference to the 53-47 was on 10/2:
▶Q !!mG7VJxZNCI 10/02/18 (Tue) 15:31:13 No.320
53-47
Q
I am not convinced the arms deal is definitely what he is referencing without additional sauce.