A poster that shows some of Venezuela's opposition leaders holding a sign with a message that reads in Spanish: "That constituent assembly will not pass" is displayed on a wall near Altamira Square in Caracas, Venezuela, Thursday, Aug. 3, 2017. Venezuela's Nicolas Maduro defiantly dismissed allegations that official turnout figures for the election of an all-powerful constituent assembly were manipulated. Pictured in the poster are Henrique Capriles, left, Lilian Tintori, second left, Maria Corina Machado, second right, and National Assembly President Julio Borges, right. ( (AP Photo/Wil Riera)
A poster that shows some of Venezuela's opposition leaders holding a sign with a message that reads in Spanish: "That constituent assembly will not pass" is displayed on a wall near Altamira Square in Caracas, Venezuela, Thursday, Aug. 3, 2017. Venezuela's Nicolas Maduro defiantly dismissed allegations that official turnout figures for the election of an all-powerful constituent assembly were manipulated. Pictured in the poster are Henrique Capriles, left, Lilian Tintori, second left, Maria Corina Machado, second right, and National Assembly President Julio Borges, right. ( (AP Photo/Wil Riera) Credit: Wil Riera

CARACAS, Venezuela — Venezuela is nearing a showdown, with President Nicolas Maduro vowing to install a new constituent assembly that will trump every other branch of government and opposition leaders calling for a mass protest to ensure delegates know their arrival is unwelcome.

The first meeting of the 545 delegates is expected to convene Friday at the legislative palace in Caracas — only yards from the room where the opposition-controlled National Assembly holds its sessions.

The legislative palace has been witness to bloody clashes in recent weeks and Friday’s installation of the all-powerful assembly, which Maduro has vowed to use to strip opposition lawmakers of their constitutional immunity, sets the stage for an intensified power struggle. Opposition lawmakers in congress have vowed they will only be removed by force.

“The only way they’ll get us out of here is by killing us,” declared Freddy Guevara, the National Assembly’s first vice president. “They will never have the seat that the people of Venezuela gave us.”

Sunday’s election of the constituent assembly has come under mounting scrutiny after the CEO of an international voting technology company said Wednesday that “without any doubt” the voter turnout numbers had been tampered with — accusations that Maduro and the National Electoral Council have dismissed. A growing list of foreign nations has refused to recognize the assembly and many within Venezuela fear its installation will open a dark chapter in the nation’s history.

“There has been a gradual erosion of democratic practice and this is a significant line that has been crossed,” said Michael Shifter, president of the Washington-based think tank Inter-American Dialogue. “To attach the term democracy to Venezuela with this new constituent assembly is on very weak ground.”

Prominent constituent assembly members like Diosdado Cabello, the leader of the ruling socialist party, have said they plan to target the opposition-controlled congress and the country’s chief prosecutor, Luisa Ortega Diaz, a longtime supporter of the late Hugo Chavez who recently broke with Maduro. As one of its first tasks, Maduro has ordered the assembly to declare Ortega Diaz’s office in a state of emergency and entirely restructure it.