Trade barriers

In this photo released by Xinhua News Agency, visitors tour the Chinese internet security firm Qihoo 360 showcasing it 5G digital security and protection system at the World 5G Convention in Beijing on Nov. 21, 2019. One of China's biggest tech companies has criticized the Trump administration for "politicizing business" after it slapped export sanctions on 33 more Chinese enterprises and government entities. (Li Xin/Xinhua via AP)

FILE - In this Wednesday, Feb. 5, 2020 file photo, European Commission's Head of Task Force for Relations with the United Kingdom Michel Barnier, right, is greeted by David McAllister, the German EU parliamentarian who is the legislature's top official on the bilateral relations. Slowed by the coronavirus pandemic and whipped up by a British-imposed deadline, talks between the EU and the UK on a future relationship in the wake of Brexit are struggling to make significant progress. A third negotiation session is drawing to a close on Friday, May 15, 2020 but so far, just over 100 days after the official exit of the UK from the EU, fundamental gaps still exist. (AP Photo/Francisco Seco, File)

A worker wearing a face mask disinfects as a precaution against the new coronavirus ahead of school reopening in a class at Yeouido Girls High School in Seoul, South Korea, Tuesday, May 19, 2020. South Korean Vice Health Minister Kim Gang-lip urged vigilance to maintain hard-won gains against the virus and called for education officials to double check preventive measures with high-school seniors returning to school on Wednesday. (AP Photo/Ahn Young-joon)

In this May 14, 2019 photo, packages of frozen beef filets from Australia, left, the United States, center, and Canada, right, are for sale at a supermarket in Beijing. China has too much at stake to destroy its trading relationship with Australia entirely but is using sanctions to send a sharp warning to the South Pacific nation about its calls for a robust coronavirus inquiry, an expert says. China has suspended beef imports from four Australian slaughterhouses and is threatening to impose huge tariffs on barley after Australia called for independent inquiry into the origins of the virus. (AP Photo/Mark Schiefelbein)

People pass by wearing face masks to protect against the spread of the new coronavirus as ride along a street in Beijing, Wednesday, May 6, 2020. China on Wednesday reported just two new cases of the coronavirus and no deaths. (AP Photo/Mark Schiefelbein)

People wear face masks to protect against the new coronavirus as they walk through a public park in Beijing, Saturday, May 2, 2020. China, where the pandemic began in December, reported one new infection and no deaths in the 24 hours through midnight Friday. (AP Photo/Mark Schiefelbein)

Members of the Equestrian Gendarmerie Units, which normally serve to protect the Topkapı Palace, wearing face masks for protection against the coronavirus, as they patrol the beaches in Sariyer outside Istanbul, Saturday, May 2, 2020. The equestrian unit is used to patrol the beach area to enforce the curfew measures, restricting people from walking around or swimming. (Ibrahim Mase/DHA via AP)

This combination of file photos shows Mexican President Andres Manuel Lopez Obrador, left, on Nov. 29, 2019, in Mexico City and President Donald Trump on April 17, 2020, in Washington. The COVID-19 pandemic could have been a fraught moment for U.S.-Mexico relations — two leaders from opposite ends of the political spectrum facing the largest crisis ever confronted by either administration. Instead, Trump and López Obrador are carrying on like old pals. (AP File Photo)

In this March 31, 2020 photo, workers in protective suits stand near a COSCO container ship docked at a port in Qingdao in eastern China's Shandong Province. China's government reported Tuesday, April 14, 2020 that exports fell further in March compared with February amid a global economic slowdown caused by the coronavirus pandemic. (Chinatopix via AP)