Trump was referencing President Barack and Michelle Obama’s trip to Riyadh in January 2015 in which the First Lady chose to forgo a headscarf.
Melania and Ivanka Trump deboarded Air Force One Saturday in the capital city of Riyadh wearing long, flowing sleeves, but no headscarves, which local women are required to do in the conservative country. While Saudi Arabia King Salman appeared happy to greet the visitors, a Trump tweet from 2015 suggested he would be offended.
**Side note I personally don't care if the women of the United States decide to wear a scarf or not. I personally think it should be the woman's decision, but I do find it quite funny that Trump tweeted this
**For the record I'm not a Obama cheerleader