The bill is not listed as a companion bill to the one introduced by Paul and Sens. Ted CruzTed CruzCBO score underlines GOP tensions on ObamaCare repeal Republicans go to battle over pre-existing conditions GOP senators distance themselves from House ObamaCare repeal bill MORE (R-Texas) and Mike LeeMike LeeRepublicans go to battle over pre-existing conditions Senate gears up for fight on Trump's 0B Saudi Arabia arms sale Senate feels pressure for summer healthcare vote MORE (R-Utah), although it appears to have the same goal as the Senate bill. That bill, S. 505, explicitly prohibits the use of drones to kill U.S. citizens.

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"The Federal Government may not use a drone to kill a citizen of the United States who is located in the United States," the Senate bill reads. "The prohibition under this subsection shall not apply to an individual who poses an imminent threat of death or serious bodily injury to another individual. Nothing in this section shall be construed to suggest that the Constitution would otherwise allow the killing of a citizen of the United States in the United States without due process of law."

Cruz, the lead sponsor of the Senate bill, introduced it a day after Paul's March 6 filibuster on the Senate floor, in which he called on the Obama administration to clarify its policy regarding domestic drone strikes. On March 7, Attorney General Eric HolderEric H. HolderVoting advocates notch win at Supreme Court Flynn refusal sets up potential subpoena showdown House votes to expand death penalty for police killings MORE wrote to Paul to say the government does not have any authority to use drones against U.S. citizens on U.S. soil that don't pose an immediate threat.

Paul said he pressed the issue after Holder seemed to waffle in answering a question about whether these sorts of drone strikes are legal. But Paul's filibuster was criticized that week by Sens. John McCainJohn McCainOvernight Defense: Trump scolds NATO allies over spending | Flurry of leaks worries allies | Senators rip B Army 'debacle' | Lawmakers demand hearing on Saudi arms deal The case for protecting America's intelligence agency whistleblowers Overnight Cybersecurity: Senate Intel chiefs get subpoena power in Russia probe | Trump orders probe of leaks | Lawmaker unveils 'hacking back' bill MORE (R-Ariz.), who accused Paul of doing a "disservice" to Americans by "making them think that somehow they're in danger from their government."