Del Rio Mayor Bruno Ralphy Lozano is working alongside Secretary Alejandro Mayorkas and the Chief of the US Border Patrol Raul Ortiz to find a solution at the border and to deport migrants, the mayor said in a tweet on Sunday.Desperate to not return back to Haiti, some migrants have begun moving from Texas back into Mexico. CNBC reported that at least 100 migrants were heading back to Mexico.As of Sunday, September 19, the US had flown 3,300 Haitians back to Haiti. Those who tried to return with resources on Sunday were met by US Customs and Border Patrol agents on horseback who were armed with whips.I have seen some of the footage, Jen Psaki, White House press secretary, said to reporters during a news briefing on Monday, referring to video of the CBP agents scattering migrants. I don't have the full context. I can't imagine what context would make that appropriate, but I don't have additional details. … I don't think anyone seeing that footage would think it was acceptable or appropriate.According to The Washington Post, the Border Patrol agents eventually let the migrants in through the border. Representative Alexandria Ocasio-Cortez said in a tweet on Monday that the current immigration system is designed for cruelty towards and dehumanization of immigrants. This is a stain on our country, she continued.Video and photos coming out of Del Rio showing US Border Patrol's mistreatment of Haitian migrants along the border are horrific and disturbing, Chairman of the House Homeland Security Committee, Rep. Bennie G. Thompson, told The Post.This mistreatment runs counter to our American values and cannot be tolerated, he added.The Department of Homeland Security said that CBP is currently investigating the crisis, according to PBS anchor Yamiche Alcindor.Secretary Mayorkas visited Del Rio today and witnessed the extraordinary work of DHS personnel, DHS spokesperson said in the statement. The footage is extremely troubling and the facts learned from the full investigation, which will be conducted swiftly, will define the appropriate disciplinary actions to be taken.We are committed to processing migrants in a safe, orderly, and humane way. We can and must do this in a way that ensures the safety and dignity of migrants, the statement concluded.DHS and CBP did not immediately respond to Insider's request for comment. The Biden-Harris administration has challenged courts for the ability to invoke Title 42 and despite activists' cries to end it.If you come to the US illegally, you will be returned, said Homeland Security Secretary Alejandro Mayorkas at a Monday news conference. Your journey will not succeed.Title 42 is an immigration policy issued by the Center for Disease Control and Prevention during Trump's presidency that allows the swift deportation of migrants as a measure to keep COVID-19 from spreading.Steven Forester, an immigration policy coordinator at the US-based Institute for Justice and Democracy in Haiti, told Al Jazeera that the order is entirely unconscionable.There's no way Haiti can handle the people that are in Haiti now given the conditions there. It can't provide for these people, he added.