According to authorities, Cruz was armed with an AR-15 semi-automatic assault-style rifle.
Many across social media quickly slammed Trump for his seemingly empty words.
Listening to @realDonaldTrump attempting to be sincere is painful,American Horror Storyactor Denis OHare tweeted.
We have no leader in this country.
No one to inspire us.
No one to comfort us.
No one to govern.
Our entire nation with one heavy heart is praying for the victims and their families, Trump said.
We are all joined together as one American family and your suffering is our burden also.
No child, no teacher should ever be in danger in an American school.
Prior to his address, former-President Barack Obama joined the chorus advocating for gun control.
We are grieving with Parkland.
But we are not powerless, Obama tweeted.
Caring for our kids is our first job.
In these moments of heartache and darkness, he added, we hold onto Gods word in scripture.
I have heard your prayer and seen your tears.
I will heal you.
We trust in that promise and we hold fast to our fellow Americans and their time of sorrow.
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