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A Central American migrant is detained by Mexican immigration agents on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. Mexican police and immigration agents detained hundreds of Central American migrants Monday in the largest single raid on a migrant caravan since the groups started moving through Mexico last year. (AP Photo/Moises Castillo)

President Donald Trump jokes with United States Treasurer Jovita Carranza at Nuss Truck and Equipment Monday, April 15, 2019, in Burnsville, Minn. (AP Photo/Andy Clayton-King)

Protesters wearing masks of U.S. President Donald Trump and North Korean leader Kim Jong Un stand near the map of Korean Peninsula during a rally demanding the denuclearization of the Korean Peninsula and peace treaty near the U.S. embassy in Seoul, South Korea, Thursday, March 21, 2019. The Korean Peninsula remains in a technical state of war because the 1950-53 Korean War ended with an armistice, not a peace treaty. More than 20 protesters participated at a rally and also demanding the end the Korean War and to stop the sanction on North Korea. The letters read "Peace and Unification." (AP Photo/Lee Jin-man)

Protesters hold signs during a rally demanding the denuclearization of the Korean Peninsula and peace treaty near the U.S. embassy in Seoul, South Korea, Thursday, March 21, 2019. The Korean Peninsula remains in a technical state of war because the 1950-53 Korean War ended with an armistice, not a peace treaty. More than 20 protesters participated at a rally and also demanding the end the Korean War and to stop the sanction on North Korea. The letters read "Restarting operations at Kaesong industrial complex and Diamond Mountain resort." (AP Photo/Lee Jin-man)

FILE- In this July 17, 2018, file photo, a FedEx employee delivers packages in Miami. FedEx reports financial results on Tuesday, March 19, 2019. (AP Photo/Lynne Sladky, File)

FILE - In this Nov. 6, 2018 file photo, a voter in Lake Oswego, Ore., places her ballot in a designated drop box outside City Hall. Days before last November's elections, members of a political action committee in Oregon went door-to-door in Portland and its suburbs and collected filled-in ballots from voters, saying they'd mail them in. But about 100 of those ballots were mailed late and not counted. The group was fined by the secretary of state (AP Photo/Gillian Flaccus, File)

A forensic worker outside the University of Glasgow after the building was evacuated when a suspect package was found in the mailroom, in Glasgow, Scotland, Wednesday March 6, 2019. Buildings at the University of Glasgow were evacuated Wednesday as police examined a suspicious package found in the mailroom, a day after three London transport hubs received letter bombs. (Andrew Milligan/PA via AP)

File-This Feb. 6, 2019, file photo shows Treasury Secretary Steve Mnuchin speaking with reporters outside the White House, in Washington. Mnuchin has informed Congress that he will stop making payments into two government retirement funds now that the debt limit has gone back into effect. In a letter Monday, March 4, 2019, to congressional leaders, Mnuchin said that he would stop making investments into a civil service retirement fund and a postal service retirement fund. (AP Photo/ Evan Vucci, File)

FILE - In this file photo dated Thursday, Oct. 23, 2008, A tugboat passes a container ship docked at APM Terminals in Elizabeth, N.J. U.S.A. APM Terminals is owned by A.P. Moller-Maersk Group of Netherlands. Shares in the world’s biggest shipping company, Denmark’s A.P. Moller-Maersk, plunged Thursday Feb. 21, 2019, after it warned of the commercial damage it would suffer from a U.S. escalation in the trade war with China. (AP Photo/Mark Lennihan, FILE)

San Francisco firefighters battle a fire on Geary Boulevard in San Francisco, Wednesday, Feb. 6, 2019. A gas explosion in a San Francisco neighborhood shot flames high into the air Wednesday and was burning several buildings as utility crews scrambled to shut off the flow of gas. Construction workers cut a natural gas line, San Francisco Fire Chief Joanne Hayes-White said. (AP Photo/Jeff Chiu)