Ron Paul on Monday said that his “big guess” about the Supreme Court’s ruling on the constitutionality of the controversial healthcare reform bill is that it will uphold the law.

The Supreme Court begins hearing three days of oral arguments on the Affordable Care Act on Monday. The case has drawn a high level of public interest and is also a political landmark, since the GOP presidential candidates are running on pledges to repeal the law and President Obama’s reelection campaign is touting the legislation as a signature achievement of his first term.

“I suspect they're going to rule it constitutional, but that is a big guess out of thin air,” Ron Paul said on Bloomberg Television. He said “this Supreme Court is slightly better than in the past, [but] they haven't done a real good job in defending the free market and the original intent of the Interstate Commerce Clause.”