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Washington (CNN) - Rand Paul has set the stage for an encore.

Fourteen months after the Republican firebrand from Kentucky railed against President Barack Obama administration's unwillingness to rule out using drones on American soil - and the lack of judicial justification for such hypothetical attacks - Paul vowed on Thursday to deliver a repeat performance.

This time its over the Presidents nominee for the U.S. Court of Appeals for the First Circuit.

"I shall not only oppose the nomination of David Barron," Paul said in a statement, "but will filibuster."

Barron, a Harvard law professor and a former acting assistant attorney general for the Obama administration, authored at least two controversial classified opinions justifying the potential use of a drone strike against American citizens - an effective death sentence - without a trial.

After pressure from several voices in the Senate, including Paul's, the White House agreed to show some of Barron's work to senators.

While acknowledging he could not reveal the contents of the memo, Paul said the documents contained "no valid legal precedent to justify the killing of an American citizen not engaged in combat."

Or, more simply, Paul said, "I am not satisfied."

While the Fifth Amendment forbids the premeditated killing of an American outside of any battlefield, the administration and the Bush administration before it have attempted to extend the definition of what constitutes an immediate and unacceptable threat to United States citizens.

In a New York Times op-ed published Sunday, Paul argued for the White House to release redacted copies of the opinions to the public and harshly criticized the Oval Office for attempting to elevate one of their authors, Barron, "one level below the Supreme Court."

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Paul to filibuster Obama judicial nominee, author of drone memos