"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.
Biden's earlier student debt relief plan, which proposed $10,000 debt relief for low-to-middle-income borrowers and $20,000 for Pell Grant recipients, was deemed unconstitutional by the Supreme Court in a 6-3 ruling.
"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.