Democratic candidate for governor David Garcia responded to a staffer's offensive tweets and to his own vague comments about a wall on the Arizona border during a debate with his two primary opponents on this weekend's "Sunday Square Off."

State Sen. Steve Farley of Tucson and non-profit executive Kelly Fryer, also of Tucson, occasionally took aim at Garcia, a former candidate for state school superintendent and the apparent front-runner in the Aug. 28 primary.

I asked Fryer to explain how she views border policy, given her rejection of border security as the overarching goal.

Farley explained why he was late to embrace the Invest in Ed ballot initiative, which would boost income taxes on top earners, and whether he specifically supports an income tax increase to fund education.

The wide-ranging debate touched on all the candidates' views on immigration, education, what keeps them up at night, and what they want each other to clarify.

"Sunday Square Off" airs at 8 a.m. Sundays on 12 News, after NBC's "Meet the Press" with Chuck Todd.

Garcia says offensive tweets ‘not reflective of campaign’

Democratic candidate for governor David Garcia responds to a staff member's offensive tweets and explains his comments about imagining "no wall" at the Arizona border.

Dem candidates pick education problem they'd solve

'Square Off' moderator Brahm Resnik asks the three Democratic candidates where their children went to school and then gives them a choice of four education problems to solve.

Going deeper on immigration, private prisons

The three Democratic candidates for governor explain their views on immigration policy and whether they would do away with private prisons.

Garcia under fire as candidates question each other

'Square Off' moderator Brahm Resnik asked the three candidates to pose their own burning question to an opponent. Kelly Fryer wanted to know 'Who's the real David Garcia?' Steve Farley wanted more information on Garcia's work under a Republican school superintendent.

Sunday Square Off bonus segment