First off, if you want to know the truth about the 9/11 hijackers, Senator Bob Graham -- the former chair of the Senate Select Committee on Intelligence who wrote the 9/11 report -- is the source to go to.

You can watch his Off The Grid interview here:

Senator Lindsey Graham needs to get his facts straight if he's serious about running for president.

Recently on CNN’s “State of the Union,” Lindsey Graham was discussing immigration. He said the U.S. needs to secure the border with Mexico as well as revamp the visa program that allows foreigners to stay for extended visits.

Then, to strengthen his case, he incorrectly claimed that “all the hijackers who attacked us on 9/11 were visa overstays.”

That simply isn't true. Only two of the 19 hijackers were in the U.S. on expired visas as of Sept. 11, 2001, according to the 9/11 Commission.

According to FactCheck.org,

It’s true that the 9/11 hijackers took advantage of a flawed U.S. visa program. A 241-page report produced by the staff of the 9/11 Commission, “9/11 and Terrorist Travel,” detailed numerous flaws in the visa program that allowed the hijackers to gain entry to and remain in the U.S. to carry out the attacks.

That report — a self-described “story of how 19 hijackers easily penetrated U.S. border security” — explained how many of the hijackers gamed the visa system by supplying fraudulent information to gain entry and/or by violating the terms of the visa while in the U.S.

But that report said that only two hijackers — Satam al Suqami and Nawaf al Hazmi, both non-pilots on the day of the attacks — overstayed their visas.

This isn't the first time Senator Lindsey Graham gets it wrong when it comes to discussing visas and 9/11.

FactCheck.org also details that about two years ago he claimed all 19 hijackers overstayed their student visas.

Yet in reality, only one student had a student visa and he did not overstay his visa.

Do you think the truth behind 9/11 will continue to be warped as presidential hopefuls continue their crusade for popularity? Sound off below.