Abraham Lincoln used it to emancipate the slaves. John F. Kennedy used it to start the Peace Corps. George W. Bush used it to limit funding for embryonic stem-cell research. U.S. President Donald Trump this week used the same unilateral presidential power — the executive order — to direct the “immediate” design and construction of a wall along the southern border with Mexico.

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🎬 VIDEO | Executive orders: What they are and how Donald Trump is using them

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