Senator Rand Paul is holding a filibuster on President Obama’s refusal to deny he has the authority to kill Americans on American soil without due process.

In a rare, traditional filibuster, Sen. Rand Paul vowed to speak on the Senate floor “as long as it takes” to draw attention to his concerns about the Obama administration’s policy regarding the targeted killing of American terrorism suspects.

The Kentucky Republican took to the floor before noon Wednesday to block an expected vote on the nomination of John Brennan to lead the CIA, with aides saying he could continue for hours. Paul, beginning his remarks, said he would continue “until the alarm is sounded from coast to coast that our Constitution is important.”

“Are we so complacent with our rights that we would allow a president to say he might kill Americans?” Paul asked. “No one person, no one politician should be allowed … to judge the guilt of an individual and to execute an individual. It goes against everything we fundamentally believe in our country.”

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Update 9:10 EST: Tweet of the night? From FDL alum DDay.