Bolivian opposition senator Jeanine Áñez has declared himself interim president of the South American country after Evo Morale's departure.
Legislators from Mr. Morales & # 39; party boycotted the session, which meant that there was no draft resolution for the appointment.
But Ms. Áñez said she was next in line during the Constitution and promised to hold elections soon.
Mr. Morales condemned the announcement, describing Áónez as "a coup mixing right senator".
The former president has moved to Mexico and said he asked for asylum there because his life was in danger.
He resigned on Sunday after weeks of protests over a disputed outcome of the presidential election. He has said he was forced to stand but had done so voluntarily "so that it would not be more bloodshed".
How did the senator become interim president?
Miss Áñez took temporary control of the Senate on Tuesday and placed her next in the chair of the presidency.
The former Deputy Senate leader assumed the position after a series of resignations.
The parliamentary session to nominate her was boycotted by legislators from Mr. Morale's Left Party for Socialism, who said it was illegal.
"Before the president's and vice president's final absence … as president of the House of Senators, I immediately assume the presidency provided for in the constitutional order," Áñez said to applause from opposition legislators.
Bolivia's highest constitutional court supported her assumption of power.
With Twitter on Twitter from Mexico, Mr. Morales condemned the "creepiest, most disappointed coup in history."
How did we get here?
Mr. Morales, a former cook farmer, was first elected in 2006, the country's first leader from the indigenous population.
He won plaudits to fight poverty and improve Bolivia's economy but drew controversy by defying constitutional boundaries to run for a fourth term in October.
The pressure had increased on him since his narrow victory in last month's vote.
The result was questioned by the Organization of American States, a regional body that had found "clear manipulation" and demanded that the result be revoked.
In response, Morales agreed to hold new elections. But his main rival, Carlos Mesa ̵
The commander of the armed forces, Gen Williams Kaliman, then urged Morales to resign in the interests of peace and stability.
Announcing his departure, Morales says he had made the decision to prevent other socialist leaders from being "harassed, persecuted and threatened".
He fled to Mexico when concerns erupted on the streets of the Bolivian administrative capital La Paz, with angry supporters of The the socialist leader clashed with the security forces.
After arriving in Mexico City on Tuesday, he thanked Mexico's President Andres Manuel Lopez Obrador, whom he credited for saving his life.
"While I have life, I will remain in politics, the struggle continues. All the world's people have the right to be free from discrimination and humiliation," he said.