The two were among 12 plaintiffs in a lawsuit brought by the American Civil Liberties Union (ACLU) challenging changes in asylum policies ordered by US Attorney General Jeff Sessions.
The trip, set to begin at the end of August, includes a stop in Poland to commemorate the 80th anniversary of the start of World War II.
The travel rush of the National Day holiday lasted from Sept 28 to Oct 8, with the holiday extended by one day this year as the traditional Mid-Autumn Festival fell on Oct 4.
The tunnel, about 190 kilometers south of Seoul, was built in 1970 for one of South Korea's first major highways. Once a symbol of the country's industrialization, it closed in 2002. An indoor farming company rented the tunnel from the government last year and transformed it into a "smart farm".
The two lists, one for the piloted free trade zones (FTZ) and one for the rest of the country, contain fewer access-limiting measures. Pilot FTZs now have 37 listed items for foreign investors, down from 45, while non-FTZ areas are required to implement 40 items instead of 48.
The two leaders also exchanged views on the Korean Peninsula situation.Xi said Washington and Pyongyang should be mindful of each other's concerns, and China will further play a constructive role.
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The two leaders decided on Wednesday to lift the bilateral relationship to a comprehensive strategic partnership of coordination for new era, and the two governments issued a joint statement on developing the lifted partnership.
The two sides have also planned to carry out the 5G-based queue tests for autonomous vehicles during the 2019 Beijing International Horticultural Exhibition that is being held until Oct 7.
The underlying infrastructure of the IOC comprises distributed cloud data centers and city networks that collect, integrate, and share the information the city provides.
The two parties believe the extension will help maintain regional financial stability, support trade and investment between the mainland and Hong Kong, and develop Hong Kong's offshore yuan market, the PBOC said.