The Trump administration has instituted a travel ban on members of Venezuela's Constituent Assembly, the legislative body convened in 2017 by President Nicolás Maduro to replace the country's opposition-held General Assembly.

A senior U.S. official told Al Jazeera on Thursday that members of the assembly had been targeted by the ban on travel to the U.S., though it wasn't clear how many Venezuelan lawmakers would be affected.

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The Constituent Assembly was given broad legal power to rewrite Venezuela's constitution by the country's Supreme Court after the court declared the General Assembly illegitimate and stripped it of legal authority.

Members of the European Union-backed International Contact Group on Venezuela, a group handling multiple nations' responses to the Venezuelan political crisis, warned this week that violence was possible if foreign powers interfered in domestic politics.

"The biggest dilemma facing Venezuela is between peace and war, which is why we are insisting in our call for calm from the parties involved and the prudence of the international community," Uruguay's President Tabaré Vázquez said, according to Al Jazeera.

The Trump administration has pledged support for Juan Guaidó, head of Venezuela's General Assembly who last month declared himself interim president of the country in an attempt to oust Maduro from power.

Maduro has accused the U.S. of orchestrating a coup in his country, while the U.S. and other nations maintain that his government does not have valid constitutional authority to lead the country.