Preview of Snyder's Flint water crisis congressional hearing

A month after Congress called for him to appear, Gov. Rick Snyder is heading  to Washington for a hearing on the Flint water crisis.

The House Oversight Committee is demanding answers about who knew what and when they knew it.

"I want everybody who is responsible for this fiasco to be held accountable -- I'm not protecting anybody," said Congressman Elijah E. Cummings.

During the hearing on Tuesday, those scheduled to appear include Flint's former emergency manager, Darnell Early, who last month refused a subpoena to testify. Also on the list is former Flint mayor Dayne Walling, former EPA Regional Director Susan Hedman, and Virginia Tech Professor Marc Edwards, who delivered damaging testimony last month.

On Thursday, Snyder will appear, along with the head of the EPA,  Gina McCarthy. It's not clear how many questions they will actually answer, since criminal investigations are underway at the state and federal levels.

"Government broke it, government must fix it," Cummings said.