Supporters of President Donald Trump are threatening to boycott Walmart for selling clothing with the phrase "Impeach 45" in its online store.

The "Impeach 45" apparel is made by a third-party seller, Old Glory, and sold through Walmart Marketplace.

Walmart appears to have pulled the clothing from its website.

This isn't the first time Walmart has come under fire for selling controversial clothing made by a third party on its website.

Walmart is under fire for offering clothes with the phrase "Impeach 45," referring to President Donald Trump, the 45th US president.

The T-shirts and baby onesie are made by a third-party seller, Old Glory, and sold through Walmart Marketplace, the retailer's website that features millions of items made by other companies.

Ryan Fournier, the chairman of Students for Trump, tweeted at Walmart about the clothing on Monday: "Why are you selling Impeach 45 baby clothes on your website????? What kind of message are you trying to send?"

Fournier's tweet helped spark a wave of backlash against Walmart, whose social-media accounts have been bombarded with boycott threats from Trump's supporters.

—#MAGA: How Donald Trump Will Save America (@CCOT_MAGA) July 3, 2018

"There are more Trump supporters than not ... That shirt outfit is offensive," one person wrote on Walmart's Facebook page. "If the left can be offended so can we. That is very offensive."

"Such disrespect for a president who won the election by voters that shop in your stores!" another said. "Shame on you walmart!! I hope that tee is worth the loss of customer base you will lose."

Walmart did not immediately respond to Business Insider's request for comment. As of 2 p.m. ET on Tuesday, all "Impeach 45" clothing from Old Glory appeared to have been removed from the website.

This isn't the first time Walmart has come under fire for selling controversial clothing made by a third party through its website.

In 2016, Walmart pulled a Black Lives Matter shirt and hoodie made by Old Glory from its online store after being accused of helping the clothing maker profit "from racial division." And last year, Walmart removed a shirt made by Teespring that read "Rope. Tree. Journalist. Some assembly required."

Old Glory is an apparel retailer based in Centerbrook, Connecticut. The company sells the "Impeach 45" clothing on other websites in addition to Walmart Marketplace, including Amazon.