Executive Orders are not specifically mentioned in the Constitution, but Article 2, Section 3, does say the President is to "take care that the laws be faithfully executed."
On January 1, 1802, Jefferson wrote back, agreeing with the Baptists: "Gentlemen ... Believing WITH you that religion is a matter which lies solely between man and his God, that he owes account to none other for faith or his worship, that the legislative powers of government reach actions only, and not opinions..."
Presidents' Day is actually Washington's birthday, recognized by an Act of Congress for government offices in Washington, D.C., in 1879, and for all federal offices in 1885.
President McKinley approved a Resolution of Congress, April 20, 1898: "Whereas the abhorrent conditions which have existed for more than three years in the island of Cuba, so near our own borders, have shocked the moral sense of the people of the United States, have been a disgrace to Christian civilization ..."
John F. Kennedy continued: "But in the two years since that revolution swept Fidel Castro into power, those promises have all been broken ... All political dissenters have been executed, imprisoned, or exiled. All academic freedom has been eliminated ... All major newspapers and radio stations have been seized ... And all of Cuba is in the iron grip of a communist-oriented police state. Castro and his gang have betrayed ... the Cuban people."