According to Bloomberg, Donald Trump’s presidential campaign returned donations exceeding the legal limit to brothers Cameron Winklevoss and Tyler Winklevoss, co-founders of the U.S. cryptocurrency exchange Gemini.

Previously, Gemini co-founders Cameron Winklevoss and Tyler Winklevoss tweeted that they had each donated $1 million in Bitcoin (15.47 BTC) to the Trump campaign, exceeding the maximum limit of $844,600 per person that the Trump committee could legally accept.