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As both vie for the 2016 GOP presidential nomination, Sens. Rand Paul (Ky.) and Ted Cruz (Texas) have set aside their increasingly apparent differences to join a handful of other lawmakers in opposition of indefinite detention of U.S. citizens.

The two presidential candidates, along with Sens. Mike Lee (R-Utah), Susan Collins (R-Maine) and Dianne Feinstein (D-Calif.), signed their names to a provision to ban indefinite detention of U.S. citizens or legal permanent residents without trial. Currently, the government’s authority to do so is implicit in the National Defense Authorization Act which is up for its annual renewal before the Senate.

“The indefinite detention of a U.S. citizen without due process is fundamentally un-American. Our founding fathers believed so firmly in the right to trial by jury that they enshrined it in the body of the Constitution, and again in the Sixth Amendment,” Paul said in a statement. “We can and will vigorously investigate and prosecute all who seek to do us harm, and we can do so while respecting the constitutional liberties of American citizens.”

The lawmakers contend that the federal government has repeatedly relied on “ongoing legal ambiguities” in the Non-Detention Act of 1971 to assert that Americans can be detained indefinitely since the 2001 iteration of the authorization.

“The Constitution does not allow President Obama, or any President, to apprehend an American citizen, arrested on U.S. soil, and detain these citizens indefinitely without a trial,” Cruz said.

The Senate passed an amendment to end indefinite detention in the fiscal year 2013 National Defense Authorization Act with 67 votes, but the measure stalled in the House.

The lawmakers Due Process Guarantee proposal would clarify that congressional authorization for use of military force and other general authorizations cannot be construed as acts of Congress permitting indefinite detention. It would further codify the “clear statement rule” to clarify that indefinite detention can only occur if Congress expressly authorizes it.

“We’ve seen over and over again that our criminal justice system is well-equipped to interrogate and convict terrorists, and I support that process. We need to stand strong against terrorism, and we need to do so within the bounds of U.S. law,” Feinstein said. “This amendment has been approved by the Senate in the past but not enacted; I’m hopeful that this year it will be adopted by both chambers of Congress.”