MEXICALI, Mexico (AP) — The Latest on a caravan of Central Americans who plan to seek asylum in the United States (all times local):

5:30 p.m.

About 170 people in a caravan of asylum-seekers have left the Mexico border city of Mexicali for the final leg of a monthlong journey to the United States.

Three tourist buses left a migrant shelter Thursday for a roughly two-hour drive to Tijuana, where they planned to seek asylum at a San Diego border crossing starting Sunday.

The buses were guarded by a Mexican federal police escort as drivers navigated a curvy, mountainous highway.

They will join about 150 others who recently arrived in Tijuana. Migrant shelters near the city's red-light district are full, forcing organizers to locate other places for temporary housing.

President Donald Trump wrote campaign supporters Thursday that the caravan must be stopped and he used it to build support for his proposed border wall with Mexico.

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3:30 p.m.

— About 175 people in a caravan of Central American asylum-seekers are on the final leg of a monthlong journey to the United States, with the Trump administration warning they could be detained and quickly deported.

The migrants in the Mexico border city of Mexicali are preparing for a bus trip to Tijuana to link up with about 175 others who have already arrived in preparation for a weekend attempt to cross into San Diego.

Lawyers plan free workshops on the U.S. immigration system for the migrants ahead of their planned attempt on Sunday to seek asylum in the U.S.

Organizer Leonard Olsen of the Pueblos Sin Fronteras group says many migrants in Mexicali were tired from their lengthy journey from southern Mexico and nervous about the possibility of being detained.