Hillary Clinton sent coal-country Sen. Joe Manchin a letter admitting she was wrong when she said, “We’re going to put a lot of coal miners and coal companies out of business” while campaigning in Ohio.

Republicans, including Senate Majority Leader Mitch McConnell of Kentucky, said the comment shows Clinton doesn’t care about coal miners or blue-collar workers and their families.

Spokesman Jonathan Kott said Manchin (D-W.Va.), whose state relies heavily on the coal industry, was furious and contacted Clinton, her advisers and even ex-President Bill Clinton to beef.

In the letter sent Tuesday, Hillary Clinton said she was “mistaken” in her remarks.

“I’m writing to clarify what I said recently regarding coal communities at a CNN town hall. Simply put, I was mistaken in my remarks,” she wrote. “Coal will be part of the energy mix for years to come.”

Manchin, who endorsed Clinton’s presidential bid last April, had no comment.

Clinton’s campaign, meanwhile, issued a memo to Bernie Sanders on Wednesday arguing that his chances of capturing the Democratic nomination vanished in the wake of her primary wins Tuesday in Ohio, Illinois, Florida and North Carolina.