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President Donald Trump speaks during a meeting with Canadian Prime Minister Justin Trudeau in the Oval Office of the White House, Thursday, June 20, 2019, in Washington. Trump declared Thursday that "Iran made a very big mistake" in shooting down a U.S. drone but suggested it was an accident rather than a strategic error. (AP Photo/Evan Vucci)

In this undated image made from video provided by the University of St. Andrews, a seal copies the sounds of the song Twinkle Twinkle Little Star, in St Andrews, Scotland. Researchers at the University of St. Andrews say gray seals can copy the sounds of human words and songs including “Twinkle, Twinkle, Little Star.” The study showed that three trained seals were able to imitate parts of the lullaby and as well as other popular tunes. The research team released their findings on Thursday, June 20, 2019 including video footage of the seals. (University of St Andrews via AP)

Technicians of Edenor electricity company stand under the rain as they work to fix a generator during a blackout in Buenos Aires, Argentina, Sunday, June 16, 2019. A massive blackout left tens of millions of people without electricity in Argentina, Uruguay and Paraguay on Sunday in what the Argentine president called an “unprecedented” failure in the countries’ power grid. (AP Photo/Tomas F. Cuesta)

FILE - In this June 20, 2017, file photo Boeing planes displayed at Paris Air Show, in Le Bourget, east of Paris, France. Uncertainty over a Boeing jet and apprehension about the global economy hover over the aircraft industry as it prepares for next week's Paris Air Show. (AP Photo/Michel Euler, File)

In this undated photo issued by Britain's Prince Harry Duke and Duchess of Sussex of their six-week-old son Archie Harrison Mountbatten-Windsor that they shared on their Instagram account @SussexRoyal to mark Father's Day, Sunday June 16, 2019. Prince Harry and Meghan Duchess of Sussex are celebrating their first Father's Day together with their son Archie, by sharing this new sepia toned image showing Prince Harry holding Archie, on their royal Instagram account. (The Duke and Duchess of Sussex/@SussexRoyal via AP) MUST BE USED WITH ORIGINAL TONING AS ISSUED - NO SALES - NO COMMERCIAL USE

The Archbishop of Paris Michel Aupetit, second left, leads the first mass in a side chapel, two months after a devastating fire engulfed the Notre-Dame de Paris cathedral, Saturday June 15, 2019, in Paris. (Karine Perret, Pool via AP)

FILE - In this file photo dated Wednesday May 1, 2019, buildings are reflected in the window as WikiLeaks founder Julian Assange is taken from court, where he appeared on charges of jumping British bail seven years ago, in London. 47-year old Assange is expected to appear via a video link at court Friday June 14, 2019, as he continues his fight against extradition to the United States, where he faces prosecution under the Espionage Act. (AP Photo/Matt Dunham, FILE)

An oil tanker is on fire in the sea of Oman, Thursday, June 13, 2019. Two oil tankers near the strategic Strait of Hormuz were reportedly attacked on Thursday, an assault that left one ablaze and adrift as sailors were evacuated from both vessels and the U.S. Navy rushed to assist amid heightened tensions between Washington and Tehran. (AP Photo/ISNA)

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