"These are people who are suffering and it hasn't changed," said Dr. Marie DeLuca, one of the organizers of the march.
"Multiple hunger strikes happening simultaneously are no coincidence: they are indicative of the desperation and suffering that immigrants are facing inside these human cages," said Sofia Casini, southern regional coordinator with Freedom for Immigrants.
"ICE has a history of incorrectly detaining U.S. citizens," said Rep. Pete Aguilar.
We need policies that welcome immigrants rather than criminalizing them. But as a first step, we need Congress to defund ICE.
Trump dismissed reports of human rights abuses at the facilities, claiming they are being run "beautifully" despite a slew or reports suggesting otherwise.
"There's a lot of misinformation that we are not allowing people to brush their teeth. This is a toothbrush," Chief Patrol Agent of the Border Patrol's Tuscon Sector, Roy Villareal, says in a bid to debunk reports on facilities in another state.
"If these agents treat Congressional representatives with cruelty and disdain, one can only imagine how terribly migrants are treated," the National Organization for Women said.
One of the first things Vermont Senator Bernie Sanders has vowed to do if elected president is "shut down the child detention centers across the country."
"We can't just focus on the children anymore. I met grandmothers, mothers and fathers who are suffering," said Democratic Representative Rashida Tlaib.
Human Rights Watch U.S. Program Executive Director Nicole Austin-Hillery said she and other lawyers were told they could not meet with sick migrant children for their own safety.
"Many of the parents are being extorted in relation to the children's process," Tekandi Paniagua, the Guatemalan consul general in Del Rio, said.
"Some kids are only two or three years old and they have no one to take care of them," one 11-year-old boy being held under federal custody said.
"Enough with a government that does not reflect our values," fundraiser Erv Portman said. "My faith teaches me we are responsible and I want to help these kids."
"We have to pass humanitarian aid to take care of these children. That is the nation we are," McCaul said.
"When we were detained, America turned its back on us... There were no protests on our behalf," said Satsuki Ina, who was born in a Japanese-American internment camp.
"Having worked at Abu Ghraib prison after the scandal there, I can tell you that the conditions for those detained at our southern border is paradise in comparison," Retired U.S. Army Reserve Major Montgomery Granger said.
"Outsourcing its responsibility to physically hold these detainees does not absolve it of its obligation to properly care for them," U.S. Rep. Diana DeGette of Colorado said of the U.S. Immigration and Customs Enforcement agency.
"They followed the legal checklist by first presenting themselves at a point of entry, and this is how America is paying them back–with cruelty and disrespect for the law," said Southern Poverty Law Center Senior Supervising Attorney Luz Virginia Lopez.
The Trump administration appears to expect to take as many as 225,000 immigrant children into custody over the next five years.
"We got a perfect storm now because of broken laws," the Republican senator said.
JP Morgan and Wells Fargo divested from private prisons after a massive public pressure campaign. GEO Group is worried about what may come next.
The ruling means U.S. immigration authorities can arrest and detain immigrants years, even decades, after they are released from prison or jail.
Homeland Security Secretary Kirstjen Nielsen took issue with the use of the word "cages" to describe the detention facilities used for children.
"ICE is required to meet basic standards of care for minor noncitizens in its custody," a letter from three major immigration advocacy groups states. "It repeatedly has demonstrated an inability to do so."
"[We] call for their immediate release," said Canadian Foreign Minister Chrystia Freeland.
"They are unwanted in Denmark and they must feel that," the country's integration minister has said.
The Office of Refugee Resettlement had 13,312 immigrant children in federal custody as of Wednesday.