(CNN) Newly released documents reveal that when he was serving in the White House under President George W. Bush, Brett Kavanaugh suggested that he thought candidate contribution limits have "some constitutional problems."

Contribution limits -- currently set at $2,700 per individual per election -- were upheld in a 1976 Supreme Court case called Buckley v. Valeo, and they have remained intact even as the court has subsequently struck down an array of other state and federal campaign finance regulations.

Kavanaugh's comments will raise questions during his confirmation hearings from Democrats who support campaign finance regulation. The release of the documents will also likely trigger complaints from critics of Kavanaugh, who argue that they need more time and more access to the thousands of pages of his emails held at the Bush library.

"Judge Kavanaugh's views on campaign finance are already pretty well-known," said Steve Vladeck, CNN Supreme Court analyst and professor at the University of Texas School of Law. "But these emails suggest that he'd go farther in striking down these regulations than the court has to date. It's hard to imagine this not becoming a point of some contention at next week's confirmation hearing."

The documents, released Friday night before a three-day weekend, depict an email exchange between Kavanaugh and Helgard Walker, who also worked in the Bush White House.

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