Five days after Trump's demand to cap credit card rates, bankers and lobbyists told CNBC they have yet to receive any formal or written guidance on the policy.

Posting on Truth Social, Trump said said he would "no longer let the American Public be 'ripped off' by Credit Card Companies."

A 10% rate cap would make large swaths of the credit card industry unprofitable, especially tied to customers with less-than-ideal credit, banks say.