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While Maxwell was heavily involved in sex crimes, it is believed her testimony would expose other pedophiles connected to her partner Jeffrey Epstein.
Comer's Democratic counterpart Robert Garcia issued a statement decrying the idea.
"It's outrageous that Republicans on the Oversight Committee are considering a pardon for Ghislaine Maxwell," he said.
"She is a sexual abuser who facilitated the rape of women and children.
He said a pardon would be a "shameful way to treat survivors".
"Oversight Democrats are united in opposing any pardon," he said.