Former Florida Gov. Jeb Bush is considered by many as the main threat to Gov. Chris Christie's potential Republican presidential nomination.

Florida Governor Jeb Bush (Oscar Sosa/Getty Images for NASCAR)

Neither has officially confirmed a run at the White House yet.

Former President George W. Bush said he would fully support a run by his brother, Jeb, but says his sibling is about 50-50 on the idea of a campaign.

Christie and Jeb Bush are friends, and the governor has told me that having him in the race would make it harder if he decided to run.

But, now he is telling CNN that is a non-factor in his own decision-making process.