The bill is not listed as a companion bill to the one introduced by Paul and Sens. Ted CruzTed CruzLewandowski: Top Cruz aide advised Trump team before NH primary Five reasons why Donald Trump could be the 'Greatest Communicator' Victims of Nazi Art theft need Congress to HEAR MORE (R-Texas) and Mike LeeMike LeeWill Trump back women’s museum? Overnight Cybersecurity: Lawmakers pushing for vote to delay warrant rule changes Coons to call for voice vote to halt changes to hacking rule 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. HolderDylann Roof’s 'show trial' exhibits Justice Department at its worst Sessions AG pick missed chance to remove partisanship from Justice Commutation of unfair sentences, an issue of human rights 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 McCainPentagon should have a civilian chief to give peace a chance McCain to support waiver for Mattis, Trump team says Senators crafting bill to limit deportations under Trump 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."