The United States, Russia, China, Germany, Britain and France in 2015 agreed to the deal with Iran that prevents Teheran from developing nuclear weapons in return for sanctions relief.
The US military confirmed on Thursday that an RQ-4 Global Hawk Unmanned Aircraft System (UAS) was shot down by an Iranian surface-to-air missile system at approximately 2335 GMT on Wednesday. Iran, however, claimed the drone downed in the southern part of the country had crossed Iranian borders.
The US Congress faces a deadline next month to fund parts of the federal government and a possible showdown over money for Trump's proposed border wall.
The UK, which voted to leave the European Union last year, was the second-most popular destination, as it has been for three years.
The United Arab Emirates and the United Nations Industrial Development Organization are the two co-hosts of this year's fair.
The United States, among some other countries, has recognized Guaido's presidency, and US President Donald Trump has warned that "all options are on the table."
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The United States has sent the USS Carl Vinson aircraft carrier group to waters near the Korean Peninsula in what it called a "reaction to provocations" from recent missile tests.
The UK's Foreign Office had no immediate comment on the report.
The USDA reduced its soybean yield estimate to 46.9 bushels per acre from 47.9 bushels last month. Analysts were expecting 47.3 bushels.
The United States, meanwhile, has remained upbeat about the prospects for talks with the DPRK, with Trump saying on Friday the firings did not violate his agreement with Kim.