Tensions between the government and opposition have been building in a constitutional dispute over whether the ailing president's swearing-in can legally be postponed. The president underwent his fourth cancer-related surgery in Cuba last month and hasn't spoken publicly in a month.
Opposition leader Henrique Capriles said earlier Tuesday that the Supreme Court should rule in the disagreement between the opposition and Chavez's government. He said the constitution is clear that the current presidential term ends on Jan. 10.
Other opposition leaders have argued that the inauguration cannot legally be put off and that the National Assembly president should take over as interim president if Chavez hasn't returned from Cuba on inauguration day.
"The Supreme Court has to take a position on what the text of the constitution says," said Capriles, who lost to Chavez in presidential elections three months ago. "There is no monarchy here, and we aren't in Cuba."
Capriles said he saw no reason to bring a formal challenge to the Supreme Court because it was obliged to rule on the matter.
Chavez's allies have suggested the inauguration can be delayed past Thursday and carried out at a later date before the Supreme Court.
While leaders of both pro- and anti-Chavez camps say they don't expect violence to break out Thursday, the dispute could lead to opposition questions about the legitimacy of government officials serving past the scheduled inauguration date.
The Venezuelan Constitution says the presidential oath should be taken before lawmakers in the National Assembly on Jan. 10 but adds that the president may also take the oath before the Supreme Court if he's unable to be sworn in before the assembly. Officials argue that clause does not explicitly mention a date, though opponents say it clearly refers to the Jan. 10 deadline.
Vice President Nicolas Maduro has called the swearing-in a "formality" and said the opposition is erroneously interpreting the constitution. Chavez has said that if he's unable to continue on as president, Maduro should take his place and run in an election to replace him.
Capriles noted, however, that Maduro "wasn't elected" to continue leading a government in Chavez's absence into a new term. "If Maduro wants to be president, it's not through that way," Capriles said.
He added Tuesday that he has spoken with various members of the military, and that they have told him "we are with the constitution."
"The Armed Force also has a role to play to play here ... of respecting the constitution," Capriles said, without elaborating, using the formal name of the military.
Jorge Rodriguez, a Caracas district mayor and campaign manager in recent elections, accused the opposition of fomenting a "conspiracy" against Chavez's government. He insisted that Chavez remains president despite his health problems and pointed out that the National Assembly had granted the president permission to travel to Cuba for his operation.
The government had said on Monday that Chavez was in a "stable situation" in a Cuban hospital receiving treatment due to a severe respiratory infection. The government says he's coping with "respiratory deficiency," but hasn't said how severe it is.
Government officials called for Chavez's supporters to gather at the presidential palace on Thursday, and said some Latin American heads of state plan to attend.
Bolivia's government confirmed that President Evo Morales would travel to Caracas.
Uruguayan President Jose Mujica also plans to fly to Caracas on Wednesday morning, Deputy Foreign Relations Minister Roberto Conde told local station Radio Uruguay on Tuesday.
Capriles urged Latin American leaders not to visit, asking them to instead demand that the Venezuelan Constitution be upheld. He said presidents of other countries such as Argentina, Brazil and Colombia take such a stance.
The opposition leader said he won't call for protests on inauguration day.
"What I won't do is put people to fight against people. Don't count on us," Capriles told reporters. "Our country doesn't need hate. Our country doesn't need fights."
Opposition coalition leader Ramon Guillermo Aveledo wrote to Organization of American States Secretary-General Jose Miguel Insulza on Monday explaining the opposition's concerns. Aveledo said in the letter that if Chavez doesn't appear on inauguration day and there is no declaration of a temporary absence of the president, "a serious violation of the constitutional order will have been committed."