Assange, currently in asylum at the Ecuadorean embassy in London, stands to be arrested by the police if he leaves, and he fears being extradited to the US.
The new president warned Assange, who has been living in the embassy for 5 years, against interfering in the political matters of Ecuador or its allies.
Lenin Moreno, a 64-year-old Socialist, won the elections on the promise of maintaining the social programmes of his leftist predecessor Rafael Correa.
In a statement, Ecuador’s leftist government said WikiLeaks’ decision to publish documents impacting the US election campaign was entirely its own responsibility and the South American country did not cede to pressure from other nations.
An earthquake in the same region had killed more than 650 people last month.