Defections from the Bolivarian Revolution occurred under the administrations of Presidents Hugo Chávez and Nicolás Maduro. The 2019 Venezuelan presidential crisis concerning who is the legitimate President of Venezuela has been underway since 10 January 2019, when the opposition-majority National Assembly declared that incumbent Nicolás Maduro's 2018 reelection was invalid and the body declared its president, Juan Guaidó, to be acting president of the nation. Guaidó encouraged military personnel and security officials to withdraw support from Maduro, and offered an amnesty law, approved by the National Assembly, for military personnel and authorities who help to restore constitutional order.