Border patrols

FILE - In this March 21, 2018, file photo, Border Patrol agent Lonnie Swartz, left, makes his way to the U.S. District Court building in downtown Tucson, Ariz., where opening arguments were scheduled to begin in his murder trial. A mistrial was declared Monday, April 23, in the case of Swartz after an Arizona jury acquitted him of a second-degree murder charge in the killing of a teen from Mexico but deadlocked on lesser counts of manslaughter. (Ron Medvescek/Arizona Daily Star via AP, File)

FILE - In this March 21, 2018, file photo, Border Patrol agent Lonnie Swartz, left, makes his way to the U.S. District Court building in downtown Tucson, Ariz., where opening arguments were scheduled to begin in his murder trial. Closing arguments are expected in Tucson, Ariz., this week in the trial of Swartz, charged in the 2012 fatal shooting 16-year-old Jose Antonio Elena Rodriguez across the Mexican border. (Ron Medvescek/Arizona Daily Star via AP, File)

FILE - In this Dec. 4, 2017, file photo, a portrait of 16-year-old Mexican youth Jose Antonio Elena Rodriguez, who was shot and killed in Nogales, Sonora, Mexico, is displayed on the Nogales street where he was killed that runs parallel with the U.S. border. Closing arguments are expected in Tucson, Ariz., this week in the trial of U.S. Border Patrol agent Lonnie Swartz, charged in the 2012 fatal shooting 16-year-old Jose Antonio Elena Rodriguez across the Mexican border. (AP Photo/Anita Snow, file)

FILE - In this June 22, 2016 file photo, Border Patrol agent Eduardo Olmos walks near the secondary fence separating Tijuana, Mexico, background, and San Diego in San Diego. California Gov. Jerry Brown agreed Wednesday, April 11, 2018, to deploy 400 National Guard troops at President Donald Trump's request, but not all will head to the U.S.-Mexico border as Trump wants and none will enforce federal immigration enforcement. (AP Photo/Gregory Bull, File)

National Guard troops guard the border in Roma, Texas, on Tuesday, April 10, 2018. The deployment of National Guard members to the U.S.-Mexico border at President Donald Trump's request was underway Tuesday with a gradual ramp-up of troops under orders to help curb the flow of illegal immigration. (Verónica G. Cárdenas via AP)

Arizona National Guard soldiers receive their reporting paperwork prior to deployment to the Mexico border at the Papago Park Military Reservation Monday, April 9, 2018, in Phoenix. (AP Photo/Ross D. Franklin)

UH-72 Lakota helicopters take off from the Armed Forces Reserve Center at Austin-Bergstrom International Airport, Friday, April 6, 2018, in Austin, Texas. Their mission is part of an order signed by U.S. President Donald Trump earlier in the week, aimed at targeting drug trafficking and illegal immigration. (Amanda Voisard/Austin American-Statesman via AP)

FILE - In this June 20, 2017, file photo, Attorney General Jeff Sessions listens during the Justice Department's National Summit on Crime Reduction and Public Safety, in Bethesda, Md. U.S. Attorney General Sessions has ordered a "zero tolerance" policy aimed at people entering the United States illegally for the first time on the Mexican border. His directive Friday, April 6, 2018, tells federal prosecutors in border states to put more emphasis on charging people with illegal entry, which has historically been treated as a misdemeanor offense for those with few or no previous encounters with border authorities. (AP Photo/Jacquelyn Martin, File)

FILE - In this Monday, June 5, 2006, file photo, Utah National Guard troops from the 116th Construction Equipment Support Company, the first National Guard unit along the border as part of Operation Jump Start, prepare to extend a wall along the U.S.-Mexico border in San Luis, Ariz. In 2018, the U.S. National Guard faces a vastly different environment than it did on its last two deployments to the border with Mexico, with far fewer illegal crossings and more Central Americans than Mexicans coming. (AP Photo/Khampha Bouaphanh, File)

FILE - This April 2, 2017, file photo made with a drone, shows the U.S. Mexico border fence as it cuts through the two downtowns of Nogales. National guard contingents in U.S. states that border Mexico say they are waiting for guidance from Washington to determine what they will do following President Donald Trump's proclamation directing deployment to fight illegal immigration and drug smuggling. The National Guard in Texas said in a statement Thursday, April 5, 2018, said the deployment is in "very early planning stages." (AP Photo/Brian Skoloff, File)