NFL Quarterback Unleashes on Donald Trump in Series of Instagram Posts: 'What Are You Really Scared Of?

As the San Francisco 49ers take on the Cleveland Browns Sunday, quarterback Colin Kaepernick took on Republican presidential frontrunner Donald Trump in a series of social media posts.

In a series of Instagram posts Friday, the 49ers quarterback — who is injured and out for the remainder of the season — blasted Trump's "racist rhetoric."

"Racism and discrimination isn't OK we are all human beings! Things need to change!" Kaepernick captioned one photo that showed a "no coloreds allowed" sign from 1925 along with a "Japs keep moving sign" from 1942 and a "Muslim free zone" sign supposedly from 2015.

Racism and discrimination isn't OK we are all human beings! Things need to change!

A photo posted by colin kaepernick (@kaepernick7) on Dec 10, 2015 at 12:12pm PST

These are facts! What are you really scared of?

A photo posted by colin kaepernick (@kaepernick7) on Dec 10, 2015 at 12:26pm PST

Will you discriminate against the same people you are about to celebrate? The same race of the man you call savior? Happy holidays

A photo posted by colin kaepernick (@kaepernick7) on Dec 10, 2015 at 1:20pm PST

Kaepernick ended his social media rant agains the business mogul with an Instagram post of a quote from retired Air Force Col. Tom Moe.

Food for thought!

A photo posted by colin kaepernick (@kaepernick7) on Dec 10, 2015 at 2:19pm PST

The Sacramento Bee reported that the posts were trending on Sunday. 

Featured image: Stephen Dunn/Getty Images