"Kids in cages! Sleeping on concrete floors with aluminum blankets! No access to simple dignities! How is this still happening???" Gomez captioned the post on Saturday, which included a black and white photo of herself.
"It's absolutely inhumane to treat anyone like this let alone children," she continued. "I can't even imagine what they are going through. We need to get this to finally stop! Don't stay silent on this human rights issue -- please call your reps 202.224.3121."
While some fans were here for Gomez speaking up on the issue, others didn't agree with her views on the controversial issue and more specifically, her photo choice for the post.
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"So horrible. America should feel ashamed. We know better and need to do better. Thanks Sel for addressing this!" a fan wrote.
"A women with power that knows how to use it for better change is also called a queen. I stan," another added.
There were some trolls who ripped Gomez for simply addressing the subject.
"Unfortunately you don't know your facts -- Obama put up the cages and Trumps been trying to work with Congress so maybe instead of calling your human rights rep, call your democratic Congress men! You should probably get your facts right before posting," a person wrote.
A user added: "I'm so sick and tired of all the millionaire celebrities acting all righteous about supporting ILLEGAL IMMIGRANTS.. if you all feel so bad why don't you all go down there and house those illegals .. OPEN THE GATES TO YOUR WALLED UP FULLY SECURE MANSIONS AND WELCOME THEM ALL WITH OPEN ARMS.. FEED THEM, EDUCATE THEM, PROVIDE THEM WITH FREE HEALTHCARE.. GO NOW!"
"Please stick to modeling and acting," another commented. "You're killing your career at this point"
by lawyers and a board-certified physician in visits last week to border patrol holding facilities in Clint and McAllen, Texas
Last week, a doctor who visited a holding facility in Clint and McAllen, Texas said the way the children are being treated has become so severe it's comparable to "torture facilities" and "felt worse than jail." Some of alleged conditions included children sleeping on concrete floors, no access to soap or basic hygiene and extremely cold temperatures.
"The conditions within which they are held could be compared to torture facilities," physician Dolly Lucio Sevier wrote in a medical declaration obtained by ABC News.
"It just felt, you know, lawless," she added. "I mean, imagine your own children there. I can't imagine my child being there and not being broken."