Republican presidential candidate Rand Paul, who has struggled to gain any traction among GOP voters, is on the cusp of not qualifying for the next GOP primary debate in December.

According to criteria for the debate released by CNN on Friday, there are three ways for a candidate to make it on stage for the main debate at 9 p.m. Candidates must have a national poll average of at least 3.5 percent, average at least 4 percent support in Iow, or average at least 4 percent support in New Hampshire.

Paul is currently qualifying for the national average, according to select polls CNN is considering, but CNN noted that he does not average 4 percent in Iowa or New Hampshire. If polls released before the Dec. 15 debate show Paul dropping nationally, it would disqualify him.

As of Friday, nine candidates qualify for the main debate: Donald Trump, Ben Carson, Marco Rubio, Ted Cruz, Jeb Bush, John Kasich, Rand Paul, Carly Fiorina and Chris Christie. In the last debate hosted by Fox Business, Christie failed to make the cut.

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