"CBP has been and will continue to prepare for the potential arrival of thousands of people migrating in a caravan heading towards the border of the United States", said Pete Flores, director of field operations in San Diego.
Beginning at 8 a.m. Tuesday, the agency will shut down three northbound lanes at the San Ysidro Port of Entry and one lane at the Otay Mesa Port of Entry.
They are not expected to come into contact with migrants but are helping to transport Department of Homeland Security (DHS) and the Customs and Border Protection (CBP) personnel, helping with building and reinforcing barriers at the border, and with planning and logistics, as well as medical and housing support. Trump has insinuated without proof that there are criminals or even terrorists in the group.
Several thousand Central American migrants marked a month on the road Monday as they hitched rides toward the western Mexico city of Guadalajara.
"We are waiting for our representative", the unidentified migrant said. "Let them close whatever they want to close, but we are going to get through anyway".
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The decline in prices continued last week after the USA said it would let eight countries keep importing Iranian oil . United States light crude lost US$2.85 a barrel, or 4.7%, to hit US$57.09, the lowest level since December 2017.
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The Philippines earlier was one of the most vocal critics of China's assertive moves in the disputed waters, where it has built up military installations and other facilities.
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When the order came to evacuate, it was like the entire town of 27,000 residents chose to leave at once, they said. Another 35 people had been reported missing and three firefighters had been injured.
About 80 migrants, the majority of whom identify as LGBT, splintered off from the larger group in Mexico City after weeks of what they say was discriminatory treatment by local residents and other travelers, Honduran migrant Cesar Mejia told reporters at a news conference on Sunday.
But things were especially tough for the first caravan. The LGBTQ migrants had organized within the caravan itself, electing leaders and taking their own census within the larger group.
Undeterred by a harder U.S. stance against them, the migrants have said they will continue the journey so that they can claim asylum. Of those, about 1,000 are on or near the border in south Texas. The migrants have come about 1,500 miles (2,400 kilometers) since they started out in Honduras around October 13.
The members were then given a bus ticket by an anonymous group to go the rest of the way to the border. Police reported about 350 migrants arrived in the Baja California border city of Tecate, near Tijuana on Tuesday.
The 5,000 migrants, who say they are fleeing persecution, poverty and violence in their home countries of Honduras, Guatemala and El Salvador, have largely been making their journey on foot.