"It's time to fight back": Hundreds of #CloseTheCamps rallies planned across the country amid reports of abuse in detention centers

"It's going to take all of us to close the camps," MoveOn wrote.

The demonstrations are taking place a day after lawmakers including Reps. Alexandria Ocasio-Cortez (D-N.Y.), Ayanna Pressley (D-Mass.), Joaquin Castro (D-Texas), and Rashida Tlaib (D-Mich.) traveled to El Paso, Texas to visit a detention centers in the area.

The delegation reported that the immigrants they spoke with were living in cramped cells where they slept on floors, had not had access to medications or been able to bathe in weeks, were in a state of emotional turmoil, and were exhibiting health problems including hair loss.

"We're talking systemic cruelty [with] a dehumanizing culture that treats them like animals," Ocasio-Cortez said of what she witnessed in the camps.

"Horrifically, these conditions aren't an accident," wrote MoveOn. "They are the byproduct of an intentional strategy by the Trump administration to terrorize immigrant communities and criminalize immigration—from imprisoning children in inhumane conditions to threatening widespread raids to break up families to covering up reports of immigrants dying in U.S. custody and abuses by ICE and CBP agents."

MoveOn wrote that the three demands of Tuesday's protests include cutting off all funding for the arrests and deportations of immigrants as well as closing the camps.

"It's time to fight back against the racist regime that is causing suffering in our name," tweeted Act.tv, a progressive activism network supporting the demonstrations. "History will remember those who stood against the atrocities."