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"Executive branch officials are not absolutely immune from compulsory congressional process - no matter how many times the executive branch has asserted as much over the years - even if the president expressly directs such officials' noncompliance," Jackson wrote, adding that "this result is unavoidable as a matter of basic constitutional law."

"Everybody was very active when they knew what we produce can help protect medical staff. We all feel honored for making our own contribution to the country's joint fight against the virus," the chairman said.

"Despite the strong commitment of the Chinese authorities, important challenges remain to curbing the spread of the disease and enforcing ASF prevention and control measures in the field," he said, citing reasons including that China possesses almost half of the world's pig population, often in high density enclosures, and that the ASF virus can survive long periods in both cold and hot conditions, and even in dried and processed pork products.

"Due to the high altitude and large temperature difference between night and day, the shoots grown in Daji are of high quality and can even be eaten raw. They can be sold at a price several times higher than those grown on plains," said Liu Haihua, Daji's Party secretary.

"Different airports should have their own clear function and positioning to differentiate one from another. In the meantime, their management must be well-coordinated, so that aviation transportation can work at high efficiency," Zhu said.