The caravan isn't due here for weeks, and there are around 4,000 people in it.

Worn down from long miles of walking and frustrated by the slow progress, many migrants have done just that, dropping out and returning home or applying for protected status in Mexico. The initial group is significantly diminished from its estimated peak at more than 7,000 migrants. A caravan in the spring ultimately fizzled to just about 200 people who reached the U.S. border at San Diego.

Mexican Interior Secretary Alfonso Navarrete Prida said about 2,300 have applied to stay in Mexico under a government plan, and hundreds more have accepted assisted repatriation.

The second and third caravans have less than 1,000 people each.

A second, smaller group of 1,000 or so migrants who forced their way into Mexico on Monday was trailing some 250 miles back. They spent Tuesday night in the city of Tapachula.

Behind them, a third group of migrants from El Salvador had already made it to Guatemala, and on Wednesday a fourth group of about 700 Salvadorans set out from the capital, San Salvador, with plans to walk to the U.S. border, 1,500 miles away.

Donald Trump is not fit for a leadership position in the United States. He never was and never will be.