Ecuadoreans easily approved a new socialist-leaning charter Sunday.
President Morales traveled to Chile Monday for an emergency South American leaders' summit on the crisis.
Chavez alleges that the US is plotting a military coup against him after Morales blames Washington for upheavals in eastern Bolivia. The US, however, denies these claims.
Bolivians vote Sunday on the fate of President Evo Morales and other top officials.