One father is speaking out after his children were exposed to measles at an outpatient clinic in Arizona.

Dr. Tim Jacks, a pediatrician, told Jenna Lee on "Happening Now" that his 3-year-old daughter, Maggie, was diagnosed with leukemia six months ago. He said that part of her treatments involve visits to hospitals and "very regular visits" to an outpatient clinic, where she gets infusions and lab work done. 

"We were just at a routine outpatient visit," he recounted. "We got a lab draw, everything was great, and then we got a phone call from the hospital four days later saying our children had been exposed to measles."

He added that his family was shocked at the call from the hospital. 

"It's shock initially, because as much as we, our family personally has been going through, this is just icing on the ugly cake," Jacks said. "We asked all the questions, we talked to the hospital, we figured out what is the risk, where do we need to go from here, what do we do to try to protect our children after this exposure."

He told Lee that they went to the same clinic the next day so that his children could get shots of the measles anti-body. 

Jacks said that his kids aren't showing any signs of sickness, but that they aren't out of the woods yet. 

"It's been a long road for us these last few weeks and really these last few months," he remarked.

Watch the video above.