A migrant camp near the US-Mexico border, south of California, has grown to about 1,000, according to the report.
The size of the congregation in Tijuana, Mexico, has increased despite requests from government officials for the group to break up their camp.
Many of the migrants are reported to be unaccompanied minors.
Earlier this week, migrants were photographed wearing T-shirts and holding posters that read “Biden, Let Us In!”