Recently, U.S. President Trump signed an executive order declaring a national emergency and threatened to impose ad valorem tariffs on U.S. imports from countries that supply oil to Cuba. According to statistics, since Trump returned to the White House, he has declared a national emergency 11 times. Added to the 11 declarations during his previous term, the total reaches 22, which make him the president with the most national emergency declarations since the National Emergencies Act was enacted in 1976.

　　The law allows the U.S. president to act without congressional approval. This frequent use of national emergency declarations to expand presidential power has drawn widespread concern and criticism across the United States.

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