A group of 50 people are waiting to enter the port of San Ysidro, at the US–Mexico border near California.

On Sunday evening, about 50 asylum-seekers who have made their way through Mexico as part of a caravan of Central Americans walked into the San Ysidro Port of Entry, just south of San Diego, but US border authorities have not allowed them to ask for asylum. People who are going to turn themselves in are wearing white strips of fabric so they can be identified. About 150 to 200 people will ask for asylum today, half of them are children. https://t.co/Sm1VGH7hrD

The caravan started with about 1,200 to 1,500 people and on Sunday about 40 presented themselves at San Ysidro in the United States to ask for asylum, citing violence and political oppression. As of Sunday evening, the US border authorities had still not allowed them to apply for asylum. Alex Mensing, of Pueblos Sin Fronteras, the group that helped organize the caravan, told BuzzFeed News that the first group to approach the entryway to the US were told by US Customs and Border Patrol (CBP) that they were at capacity.

"CBP officials said, 'We are at capacity — at this time we cannot accept any more asylum-seekers; you can wait on one side,'" Mensing said. "So the asylum-seekers are next to the door waiting for whenever it is CBP is capable of receiving asylum-seekers." Adolfo Flores / BuzzFeed News

None of the 50 migrants who walked into the port of entry have been allowed to ask for asylum. A group of 19 mostly women and kids are planning on sleeping on the floor tonight and waiting.

It is still not clear what will happen to them in the long run, because the US president, attorney general, and leaders of the Department of Homeland Security have called the caravan a threat to national security. US law does require that asylum-seekers be given a fair hearing. If migrants tell border officials that they are afraid to return to their country of origin, they have to be processed and held until an asylum officer can determine if their claims are credible. Still, that process often takes months. "We wish the United States government was capable of accepting more than a few hundred asylum-seekers at any given time since we can certainly pick up more than a thousand people in an ICE raid on any given day and deport them," Mensing said. "But unfortunately that is not the case. Hopefully one day that is the case." In terms of CBP capacity at the San Ysidro Port of Entry, Nicole Ramos, an attorney with Al Otro Lado, told BuzzFeed News that the US immigration agency has room to take in 316 asylum-seekers at any given time. CBP spokesperson Ralph DeSio told BuzzFeed News that the agency is "not providing numbers."

The asylum-seekers from Central America gathered in Tijuana Sunday morning near the US–Mexico border fence. Ariana Drehsler for BuzzFeed News Migrants from Central America hang out in front of the Port of Entry in Tijuana waiting to see if they will be allowed to enter.

Misael, a migrant who has been with the caravan since it started on March 25 in Tapachula, Chiapas, in the far southwest of Mexico, said he’s happy to finally be in Tijuana. "We’re so close, we’re one step away from our dream," he said to BuzzFeed News. Misael, a migrant who has been on the caravan since the beginning, said he’s happy to finally be in Tijuana. “I am really happy to be here with the other people from my country. We’re so close, we’re one step away from our dream.” https://t.co/yyNPpqhILT

Misael is just one of many seeking asylum in the United States, despite President Donald Trump's criticism The caravan is now minutes away from the port of entry in Tijuana.

About half of the asylum-seekers are children. Linda, who came with her two kids and a granddaughter, said the attorneys they’ve spoken with have explained the good and the bad aspects of seeking asylum. “The hunger, the sleepless nights don’t matter. We’re going to keep fighting for our families.” https://t.co/fVq9OaIDzh

However, on Sunday afternoon, CBP said it was already at capacity. This may mean that some of the asylum-seekers will have to remain in Tijuana before they can be processed by the US government. US Customs and Border Protection says they reached capacity at the San Ysidro port of entry in Tijuana. “We saw the statement but nobody has talked to us,” said Alex Mensing an organizer with Pueblos Sin Fronteras. “If they want to come talk to us they can come talk to us.” https://t.co/BBZ2ubMmjE

"I'm nervous because we don't know how things are going to be on the other side," one 16-year-old asylum-seeker, Katrina, told BuzzFeed News as she walked into the port of entry. It’s actually 40 migrants from the caravan who are at the port of entry in Tijuana. They were accompanied by lawyers and advocates. Hearing they may all be turned away today because CBP says it’s at capacity.