Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.) said Sunday that he’s “undecided” on President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's Supreme Court nominee, Brett Kavanaugh, citing concerns with the judge’s rulings on issues of privacy and the Fourth Amendment.

Paul said on “Fox & Friends” that he’s keeping an open mind to Kavanaugh’s nomination and plans to meet with the judge in the coming weeks. But Paul said he’s “concerned” about the judge, pointing to his opinion in the case of Klayman v. Obama.

Paul — who has long been a critic of government overreach on matters of civil liberties — has taken issue with Kavanaugh’s writing in the case, in which the judge said the “government’s metadata program is entirely consistent with the Fourth Amendment.”

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“I am worried though, and perhaps disappointed, that I think Kavanaugh will cancel out [Justice Neil] Gorsuch’s vote on the Fourth Amendment,” Paul said.

“There are 10 rights or 10 amendments listed in the Bill of Rights and so the Fourth Amendment is one of them,” Paul said. “So, we’re already down one of them, let’s see how he does on the other nine.”

The senator added that he plans to have a “frank discussion” with Kavanaugh, but acknowledged that Supreme Court nominees don’t often provide much information in such conversations.

“But I think the conversation is useful, and I think it’s worth him hearing that I don’t think anybody in America believes that when you use a cell phone company, or when you use Visa, or when you us a bank that somehow you’ve given up your privacy,” Paul said.

Rand Paul: "At this point, I'm undecided" on Kavanaugh. pic.twitter.com/pBH6kxnBuh — Fox News (@FoxNews) July 15, 2018

Trump nominated Kavanaugh last week to replace retiring Justice Anthony Kennedy.

Paul could prove a key swing vote in the upcoming nomination process.

Republicans hold a 51-49 majority in the Senate, but with Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.) battling brain cancer at his home in Arizona, the GOP can ill afford any defections.