Sen. Rand Paul (R-Ky.) attempted to filibuster President Barack Obama's nomination of John Brennan to the position of CIA director on Wednesday on the floor of the U.S. Senate.

"I will speak until I can no longer speak," Paul said, according to the Huffington Post.

Citing concerns over civil liberties and abuse of executive power since the President Obama has been in office, including the drone strike program, Paul said he could not support the choice of John Brennan for director of the CIA.

"Where is the Barack Obama of 2007?" Paul asked. "If there were an ounce of courage in this body, I would be joined by many other senators. Are we going to give up our rights to politicians?"

Rand Paul is particularly upset about a letter he received from United States Attorney General Eric Holder, asserting that the government has legal authority to kill American citizens on U.S. soil that are considered a threat to national security.

"When I asked the president, 'Can you kill an American on American soil,' it should have been an easy answer," Paul said Wednesday. "It's an easy question. It should have been a resounding an unequivocal, 'No.' The president's response? He hasn't killed anyone yet. We're supposed to be comforted by that. The president says, 'I haven't killed anyone yet.' He goes on to say, 'And I have no intention of killing Americans. But I might.' Is that enough? Are we satisfied by that?"

The Ron Paul filibuster reportedly began at roughly 11:45 a.m.

As constitutional law decrees, Paul spoke continuously until a little before 3 p.m., saying that getting information from the president about drone strikes was "like pulling teeth."

He was then relieved by Sen. Mike Lee (R-Utah) followed by Sen. Ted Cruz (R-Texas) who spoke for 30 minutes starting at 3:10 p.m.

"You must surely be making Jimmy Stewart smile," Cruz said, evoking the classic film "Mr. Smith Goes To Washington."

The filibuster gained support from across the aisle, just before 4:00 pm, when Sen. Ron Wyden (D-Ore.) joined in.

Republican senators Marco Rubio (R-Fla.) and Saxby Chambliss also assisted in the Rand Paul filibuster of Obama's choice for CIA director.

"I will not sit quietly and let him shred the constitution," Paul said of Obama.

As of 6 p.m. Wednesday evening, Rand Paul and his Senate collegues were still filibustering.

See Rand Paul filibuster President Obama's nomination of John Brennan for CIA director:

