(KTEN) — Oklahoma Republican Sen. Markwayne Mullin is working to strengthen cybersecurity protocols at the 988 Suicide & Crisis Lifeline.

This follows an online attack that led to a day-long outage of the service last December.

Callers weren't able to reach the crisis line, and were instead greeted by a recorded message informing them of the outage. 

Mullin and Independent colleague Kyrsten Sinema introduced the 9-8-8 Lifeline Cybersecurity Responsibility Act to ensure the integrity and availability of the critical resource.

"We can not allow a hotline for mental health to be offline for 24 hours," Mullin said. "One life lost to a  mental health crisis that could have been saved is one too many."

The 988 number was established nationwide last July as a simple way to call for help with mental health and suicide issues.