from the are there there find a place aand surrender themselves to authorities for processing. officials in town like here this del rio, texas, they re concerned about whether or not their cities can keep up with that constant flow of migrants. resources are already stretched thinker so it s a careful balance. we spoke with value verde county commissioner bo meddleton who said there could be anywhere from 20-50,000 migrants in mexico right now who are waiting to find a place to cross. he s worried about when the next one will happen, but most importantly, where. it s the inevitable it s coming again. now, whether it comes to del rio, eagle pass, laredo, mcallen or some other community up and down this border, this issue s coming again. you know, when they continue to change the rules and allow people into this country, to cross illegally, it s an open invitation. reporter: now, when those kind of big migrant caravans come across the border, they don t just impact u.s. border cities