UPDATE 5/2/19:

After more than 24 hours worth of time was spent on a controversial vaccine bill during the legislative session, the bill died on Thursday according to Senate Republicans.

"HB 12-1312 (the controversial vaccination bill) was laid over until Friday, meaning it no longer has enough time to be passed this session," the Senate GOP tweeted out Friday at about 2:30 p.m.

to read the entire bill summary.

PREVIOUS STORY 5/2/19:

A controversial bill that would make it harder for parents to opt out of vaccinating their kids to attend school has taken another step forward.

According to a tweet sent out by the legislature early Thursday morning, the measure passed a Senate committee by a vote of 4-3.

Colorado residents started reaching out to 11 News Wednesday night outraged over a set time limit put on public testimony. When the bill was brought forth at about 8:45 Wednesday night, supporters and opponents were told they'd each get two hours of public testimony.

Hundreds of people reportedly lined up on Wednesday to fight the bill.

Prior to the announcement that public testimony would be limited to four hours, Senate Democrats spokesperson Keith Barnish told 11 News there was already 14 hours of public testimony on the proposed legislation in the House along with nine hours of discussion on the floor.

HB19-1312, School Immunization Requirements, was introduced to the Senate on Wednesday after passing the House. The proposed legislation would create a standard form for parents and guardians who want their children exempted from having to get immunizations to attend school.

to read the entire bill summary.

It is crunch time for Colorado lawmakers with the 72nd General Assembly scheduled to adjourn Friday.

“We have an obligation to be proactive -- not reactive. This is a public health crisis. Waiting for a tragedy to happen is not an option. This is about the safety of our students, and experts have been consulted in crafting this important legislation. Colorado ranks last in the country for kindergarten immunizations. We need to do better.” said Rep. Mullica, D-Northglenn, according to a release sent out Saturday. “I urge the Senate to take up and pass this bill.”

"I don’t know that personally identifiable information aides in making the public aware or helping contain a vaccine-preventable disease or what they would claim is a vaccine preventable disease,” Matt Baylor with Pro-Health Choice Vaccination told 11 News about the bill. “Colorado is one of the healthiest states in the nation, so you would think if immunizations correlate with health, then we would be one of the unhealthiest states in the nation.”

The bill is now on its way to the full Senate. It's already passed the House.