Drivers wait to cross the Mexico-U.S. border from Tijuana, Mexico, Monday, Nov. 19, 2018. The United States closed off northbound traffic for several hours at the busiest border crossing with Mexico to install new security barriers on Monday, a day after hundreds of Tijuana residents protested against the presence of thousands of Central American migrants. (AP Photo/Rodrigo Abd)

Migrants traveling with a caravan hoping to reach the U.S. border, wait to board a bus in La Concha, Mexico, Wednesday, Nov. 14, 2018. Buses and trucks are carrying some migrants into the state of Sinaloa along the Gulf of California and further northward into the border state of Sonora. The bulk of the main caravan appeared to be about 1,100 miles from the border, but was moving hundreds of miles per day. (AP Photo/Marco Ugarte)

Central American migrants line up for a meal at a shelter in Tijuana, Mexico, Wednesday, Nov. 14, 2018. Migrants in a caravan of Central Americans scrambled to reach the U.S. border, catching rides on buses and trucks for hundreds of miles in the last leg of their journey Wednesday as the first sizable groups began arriving in the border city of Tijuana. (AP Photo/Gregory Bull)

Central American migrants travel as a caravan toward the U.S. border on the highway that connects Guadalajara with Tepic, Mexico, Tuesday, Nov. 13, 2018. Many migrants say they are fleeing rampant poverty, gang violence and political instability primarily in the Central American countries of Honduras, Guatemala, El Salvador and Nicaragua. (AP Photo/Rodrigo Abd)

People seeking asylum in the United States are seen through a fence at the San Ysidro Port of Entry Friday, Nov. 9, 2018, in San Diego. The military is expected to have the vast majority of the more than 7,000 troops planned for the mission along the border deployed by Monday, and that number could grow. (AP Photo/Gregory Bull)

Voters line up to receive ballots while others fill voting booths inside the northwest Bismarck polling place in Century Baptist Church on Tuesday evening. (Tom Stromme/The Bismarck Tribune via AP)

Central American migrants, part of the caravan hoping to reach the U.S. border, get a ride on trucks, in Donaji, Oaxaca state, Mexico, Friday, Nov. 2, 2018. The migrants had already made a grueling 40-mile (65-kilometer) trek from Juchitan, Oaxaca, on Thursday, after they failed to get the bus transportation they had hoped for. But hitching rides allowed them to get to Donaji early, and some headed on to a town even further north, Sayula. (AP Photo/Marco Ugarte)

Pedestrians pass members of the U.S. military working to place razor wire along the U.S.-Mexico border on the McAllen-Hidalgo International Bridge, Friday, Nov. 2, 2018, in McAllen, Texas. (AP Photo/Eric Gay)