Former New Mexico Governor Gary Johnson on Sunday was chosen as the nominee of the Libertarian Party at its convention in Orlando, Florida.

Johnson, 63, picked former Massachusetts Governor Bill Weld as running mate.

In announcing his run for the White House in January on Fox Business, Johnson said that the nation's biggest issue is its increasing debt.

This is Johnson's second presidential campaign. In 2012, he dropped his bid to become the GOP presidential nominee to pursue the Libertarian Party's nomination.

Before leaving the Republican Party, Johnson endorsed marriage equality.

“As a believer in individual freedom and keeping government out of personal lives, I simply cannot find a legitimate justification for federal laws, such as the Defense of Marriage Act, which 'define' marriage. That definition should be left to religions and individuals – not government. Government's role when it comes to marriage is one of granting benefits and rights to couples who choose to enter into a marriage 'contract.' As I have examined this issue, consulted with folks on all sides, and viewed it through the lens of individual freedom and equal rights, it has become clear to me that denying those rights and benefits to gay couples is discrimination, plain and simple,” Johnson said during an online town hall hosted by gay GOP group GOProud.

Johnson is currently polling in two different polls at 10 percent. But candidates must be at 15 percent in the polls to participate in the presidential debates.