"We believe it is important to provide you, the donors who generously fund and raise money, with a list of relevant questions considering the current circumstances faced by his campaign," the memo reads.
"Your concern is that the Ukrainians, a country most people can't find on a map, don't have enough tanks? I think it's a fair question to ask: Where's the concern for the United States in that?" Tucker asked.
The tests, which took place over 12 weeks with some of the world's leading banks, including Citigroup Inc. and Wells Fargo & Co., sought to evaluate the potential of digital currencies to enhance both domestic and international payment systems.
