Rosas has been reporting from the US/Mexico border passage at Yuma Arizona, as he shows in the text of his tweets:
"On the ground in Yuma Arizona. While the Border Patrol was processing a family of three who said they were from Venezuela, two adults and one minor walked up to the gap in the border wall. A Yuma Police officer told me hundreds of immigrants are crossing into Yuma every day."
It seems that the MO of most or all of these migrants is to basically cross the border without authorization and turn themselves in to authorities right away. In many cases, it seems that they are released on nothing more than a commitment to appear in court at a later date.
"Since sending the last tweet, another small group of illegal immigrants showed up to turn themselves in to Border Patrol. A group of around 30 people crossed into Yuma at another gap in the border wall in Yuma," continues Rosas in his tweets.
The gap Rosas refers to in the border wall can be obviously viewed in one of the pictures he has posted:
Rosas further shows that immigrants are coming from all over the globe. In his short time of observance, there were people from Venezuela, Nicaragua, and even Uzbekistan, as opposed to the tens of thousands of Haitians who crossed over recently further east at Del Rio Texas.
"The reason why this area is a popular crossing spot is because the river is low by the dam. This group who said they’re from Nicaragua were led by a coyote. No Border Patrol was around at first due to lack of manpower, but a BP van came by shortly after they crossed."
"This family that just crossed the Colorado River told me they’re from Uzbekistan, that’s a first for me. Three adult males who illegally crossed into the US here in Yuma showed me their Uzbekistan passports. They turned themselves in to the BP agent who was by the gap in the border wall."
Though meanwhile, it doesn't seem President Biden does enough to treat the situation because as US immigration agencies processing the historic surge of illegal migrants crossing the southern border struggle to handle the crowds, it has been announced about only 2 weeks ago that the Biden administration has been depositing "numerous" migrants deep into the US. Migrants have been freed into US cities like Chicago, Denver, and New York City, far from the southern border.