President Donald Trump on Saturday lashed out at the growing number of states refusing to give voters' names, addresses and sensitive personal information to a commission he created to investigate alleged voter fraud.

"Numerous states are refusing to give information to the very distinguished VOTER FRAUD PANEL," he wrote on Twitter. "What are they trying to hide?"

More than 20 states, including Virginia, Kentucky, California, New York and Massachusetts, have declined to provide some or all of the information, saying it was unnecessary and violates privacy.