Missouri Republican Sen. Roy Blunt launched a new push Tuesday against changing the Senate rules with a simple majority, as advocates sought to explain the constitutional justification for the maneuver.

Blunt, the Republican Conference vice chairman, launched a website featuring statements from Democrats criticizing simple majority rules changes when proposed by Republicans in the past. Blunt and other Republicans argue that further changes would be inevitable beyond what Democrats currently propose, if the rules are changed without support of two-thirds of the chamber in January.

While only a simple majority would be needed to adopt new rules, the current rules allow such a proposal to be filibustered, with two-thirds required to invoke cloture and limit debate.

Blunt spoke at The Heritage Foundation Tuesday to build interest in his effort among conservatives. He expressed the view that a simple majority rules change would poison the well for future cooperation on routine chamber business that requires unanimous consent.

Even if Senate Democrats move forward with a package of changes using the simple majority procedure, the alterations currently under discussion would still have the Senate dependent on unanimous consent agreements.