Sen. Rand PaulRandal (Rand) Howard PaulThe buck stops here: How to restore accountability to the federal regulatory system Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand Lawyer: Flynn will keep cooperating after co-conspirator revelations 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 LeahyDem senators demand GOP judicial group discloses donors Senate Democrats skipping Pence's border trip Democrats want investigation into cost, legality of Trump's July Fourth event MORE (D-Vt.) and Senate Intelligence Committee Chairwoman Dianne FeinsteinDianne Emiel FeinsteinThe peculiar priorities of Adam Schiff Dem senators demand GOP judicial group discloses donors Senate Democrats skipping Pence's border trip 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 GrahamWhy Trump's bigoted tropes won't work in 2020 The Memo: Toxic 2020 is unavoidable conclusion from Trump tweets GOP put on the back foot by Trump's race storm 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 HagelTrump's pick for Pentagon chief wins allies on Capitol Hill Trump pick brings scrutiny to 'revolving door' between Pentagon, industry Overnight Defense: Senators plan 22 resolutions to block Saudi arms sale | Trump defends transgender military plan | Trump, lawmakers prep to mark D-Day anniversary 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.