Sen. Rand Paul (R-Ky.) is bringing a new — and more aggressive — approach to a longstanding debate over the Defense authorization bill, threatening to filibuster the bill to get a vote on his amendment limiting indefinite detention.

Paul's amendment takes a new tack to curb the military's ability to indefinitely detain U.S. citizens suspected of terrorism by affirming they have the right to a speedy trial by jury under the Sixth Amendment.

His push to change the indefinite detention laws for U.S. citizens follows a contentious fight last year where liberal Senate Democrats waged an unsuccessful attempt to scale back the detention laws before an 11th-hour, watered-down compromise was ultimately reached.