Sen. Rand PaulRandal (Rand) Howard PaulThe Hill's Morning Report — Trump and Congress at odds over Russia GOP leader blocks resolution backing intelligence community on Russia Rand Paul blocks Sanders's Russia resolution, calls it 'crazy hatred' against Trump MORE (R-Ky.) on Wednesday threatened to hold John Brennan's nomination for CIA director unless he receives more answers on the administration’s drone program.

“I have asked Mr. Brennan if he believed that the President has the power to authorize lethal force, such as a drone strike, against a U.S. citizen on U.S. soil, and my question remains unanswered," Paul said in a statement. "I will not allow a vote on this nomination until Mr. Brennan openly responds to the questions and concerns my colleagues and I share.

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"These issues must be discussed openly so that the American people can understand what constraints exist on the government’s power to use lethal force against its citizens," Paul continued. "Before confirming Mr. Brennan as the head of the CIA, it must be apparent that he understands and will honor the protections provided to every American by the Constitution."

Brennan, Obama’s top counterterrorism adviser, faced a contentious confirmation hearing last week, as lawmakers pressed him on the legality of using armed drone strikes against suspected terrorists, in particular American citizens.

The increased congressional scrutiny followed the leak of a Justice Department (DOJ) memo laying out the circumstances in which the administration would authorize a deadly drone strike on a U.S. citizen.

Lawmakers, though, have demanded that the DOJ share its actual legal memos justifying the targeting of Americans abroad.

The administration attempted to defuse congressional anger by providing a private briefing to lawmakers before Brennan’s hearing. Brennan also testified that the administration only authorizes lethal force as a “last resort to save lives.”

But the briefing and Brennan’s testimony did little to satisfy lawmakers. Senate Judiciary Committee Chairman Patrick LeahyPatrick Joseph LeahySenate Dems protest vote on controversial court pick Budget chairs press appropriators on veterans spending Kavanaugh paper chase heats up MORE (D-Vt.) and Senate Intelligence Committee Chairwoman Dianne FeinsteinDianne Emiel FeinsteinSunk judicial pick spills over into Supreme Court fight Senate GOP breaks record on confirming Trump picks for key court Deal to fix family separations hits snag in the Senate MORE (D-Calif.) have said they will hold more hearings on the issue.

Feinstein last week also suggested creating a federal court to oversee and approve drone strikes, but Republicans quickly rebuffed the proposal.

“I think it is a terrible idea,” Sen. Lindsey GrahamLindsey Olin GrahamSunday shows preview: Questions linger over Trump-Putin summit Soccer ball Putin gifted to Trump gets routine security screening Graham: Biggest problem is Trump ‘believes meddling equals collusion’ MORE (R-S.C.) told The Hill.

Over the weekend Graham also said he would put a hold on Brennan's nomination as well as former Sen. Chuck HagelCharles (Chuck) Timothy HagelGOP lambasts Trump over performance in Helsinki Overnight Defense: Latest on historic Korea summit | Trump says 'many people' interested in VA job | Pompeo thinks Trump likely to leave Iran deal Should Mike Pompeo be confirmed? MORE (R-Neb.), Obama’s nominee for Defense secretary, until the administration provides more details about its response to the 2012 attack on the U.S. Consulate in Benghazi, Libya.