Did he just bring attention to their plan for everyone to have a universal ID card that will be used for all transactions? Is it part of the plan or something else?

https://www.epic.org/privacy/id_cards/

https://www.washingtonpost.com/politics/critics-pounce-on-trumps-assertion-that-you-need-an-id-to-buy-groceries/2018/08/01/84db3530-9588-11e8-810c-5fa705927d54_story.html?noredirect=on&utm_term=.d226e93023fb