Donald Trump Jr. on Tuesday compared immigrants to zoo animals in a controversial Instagram story regarding the wall his father wants to build along the US-Mexico border.

Trump Jr. has since deleted the post, which said, “You know why you can enjoy a day at the zoo? Because walls work.”

The son of the President of the United States just compared immigrants seeking asylum to zoo animals.

Good night, America. pic.twitter.com/T7VBCuU36w

— Nick Jack Pappas (@Pappiness) January 9, 2019

But many on social media took screenshots of the post before it was taken down, sparking widespread backlash against Trump Jr.

In 2016, Trump Jr. provoked an outcry from critics when he turned to Twitter to liken Syrian refugees to a bowl of poisoned Skittles.

The latest post came shortly after Trump declared in an Oval Office address Tuesday night that the country was facing a “crisis” on its southern border over undocumented immigrants. In his address, Trump proposed erecting steel slats to protect the border.

The younger Trump’s Instagram post prompted this comment on Twitter: “Actually I can’t enjoy a day at the zoo right now. The National Zoo is currently closed due to the #TrumpShutdown”

Twitter was furious with the comparison:

Just the first son equating poor brown people and children to animals. I wonder if this is gonna be received with the same outrage the “let’s impeach the mf” remark did.

— Vivian Vacca (@ViviVacca) January 9, 2019

Not a single one of them has risen to meet the tremendous opportunity they were given as members of the First Family. Not one. Not for a moment.

— Mo (@mo_aug3) January 9, 2019

Junior will be experiencing life in a cage in the not too distant future.

— Glenn Harmon (@gharmon414) January 9, 2019

He’ll be enjoying his own walls very soon.

— csd (@csd) January 9, 2019

Taking solace in the thought that Don Jr and various members of his crime syndicate family including Individual 1 will soon know the feeling of being walled up behind bars.

— Zelda (@TheyWereStolen) January 9, 2019

I'm so confused. Besides the relatively obvious racist undertones, has he ever been to a zoo? The walls keep animals IN, not people OUT! Plus, sometimes animals get OUT and people get IN anyways!

— Chris Dawes (@Cdawes81) January 9, 2019

Last night Donald Trump Jr. posted on instagram: "You know why you can enjoy a day at the zoo? Because walls work."

Immigrants are not Animals at a zoo!
Immigrant children are not violence beasts!

The only animals here, are you @DonaldJTrumpJr, and your disgusting father!

— Ed Krassenstein (@EdKrassen) January 9, 2019

Donald Trump Jr. said that a border wall is like a zoo fence protecting you from animals. Gross. It’s like he wants to distract from the fact the Russian lawyer he met with in Trump Tower worked for the Kremlin. And knew it. That’s specifically why he met with her. Lock. Him. Up.

— Scott Dworkin (@funder) January 9, 2019