(CNN) During a fiery hearing Friday, acting Attorney General Matt Whitaker conceded that the administration was not tracking prosecutions of parents and legal guardians separated from children after being apprehended at the US-Mexico border.

Democratic Rep. Pramila Jayapal of Washington posed the question in a heated exchange with Whitaker.

"Before or after the zero tolerance policy was put into place -- and I call it the 'zero humanity' policy -- did the US attorneys track when they were prosecuting a parent or legal guardian who had been separated from their child? There's only one answer to this. It's gone through the courts," Jayapal said.

"Did we track it?" Whitaker responded.

Jayapal followed up: "Did you track when you were prosecuting a parent or legal guardian who had been separated from a child?"

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