Biden uses 'inshallah' in response to Trump during debate, lighting up Twitter - CNN
It can perhaps be seen as the Muslim counterpart to the Yiddish adage, "Man plans, and God laughs."
Children in the Muslim world will often say that when a parent responds to a question with "inshallah," it signals an unfulfilled promise, while unreliable timekeeping is lightheartedly chalked up to "inshallah timing."
"Yes, Joe Biden said 'Inshallah' during the #Debates2020 debate," tweeted political commentator Wajahat Ali.
No, saying inshallah doesn't make you Muslim."
So when Biden called the President out on his amorphous sense of timing around his long-promised tax returns, "inshallah" seemed to hit the nail on the head for those well-versed in Muslim and Arab culture.