The Fox News host asked Texas' Greg Abbott why he has been outspoken about Biden's handling of the issue but didn't complain when Trump was president.
The Fox News host said he's accused of "white replacement theory," but it's really a "voting rights question."
Vulnerable asylum-seekers who are stuck in the backlog are unable to legally work, pursue educational opportunities, or obtain medical care.
Customs and Border Patrol also documented nearly 19,000 unaccompanied minors at the border throughout March.
Journalists were allowed into a border detention facility in Donna, Texas, for the first time.
The Texas senator, who fled to Cancun during a crisis last month, tried a new publicity stunt from this side of the border.
Cruz's recent images from his tour of the U.S.-Mexico border are a deflection as he ignores more pressing issues in his own state, O'Rourke said.
President Joe Biden is struggling to deal with a surge of migrants on the southern U.S. border, as seen in photos showing crowded Border Patrol tents that are not designed for long-term custody.
The former president's delay in conceding the election slowed key appointments to an agency he ravaged. But Biden's approach could be worsening the problem.
President Joe Biden is committed to implementing a more humane system than his predecessor. But the logistics have proven daunting.