After at least 25 states have challenged or refused to comply with requests for voter registration data, President Donald Trump took to Twitter Saturday blasting the two dozen states, asking "what are they trying to hide?"

Numerous states are refusing to give information to the very distinguished VOTER FRAUD PANEL. What are they trying to hide? — Donald J. Trump (@realDonaldTrump) July 1, 2017

In the Trump adminstrations's quest to prove that illegal votes cost him the popular vote in the November election, The Presidential Advisory Commission on Election Integrity, formed last month via an executive order by Trump, asked the 50 secretaries of state this week to provide the voter data, The Hill and The Washington Post report.

Among the states objecting so far are California, Connecticut, Indiana, Iowa, Kentucky, Massachusetts, Maine, Minnesota, Mississippi, New Mexico, Nevada, New York, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Utah, Vermont, Virginia, Washington and Wisconsin.

Kansas Secretary of State and the panel's vice chairman Kris Kobach took a similar stance as Trump in an inteview with NPR Friday.

"Frankly, if a state like Kentucky or California won't provide available information, one has to ask the question, 'Why not?'" Kobach told NPR. "I mean, what are they trying to hide if they don't want a presidential advisory commission to study their state voter rolls?"

Several states, including Indiana and Kentucky have replied.

"Indiana law doesn't permit the secretary of state to provide the personal information requested by Secretary Kobach," Indiana Secretary of State Connie Lawson said.

Lawson added the only information publicly available in Indiana was "name, address and congressional district assignment."

Kentucky's Secretary of State Alison Lundergan Grimes, a Democrat, told MSNBC on Friday the request wouldn't be fulfilled "on my watch," adding, there wasn't "enough bourbon here in Kentucky to make this request seem sensible."