Washington (CNN)-Democratic Massachusetts Rep. Michael Capuano, who came under fire for heated comments he made at a union rally earlier this week, apologized for his remarks Thursday.

"I strongly believe in standing up for worker rights and my passion for preserving those rights may have gotten the best of me yesterday in an unscripted speech," he said in a statement. "I wish I had used different language to express my passion and I regret my choice of words."
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