Colombia’s President Juan Manuel Santos on Friday said he would not recognize the result of Sunday’s vote in Venezuela to create a new National Constituent Assembly, which will have the right to rewrite the country's constitution and override other institutions including the opposition-controlled National Assembly.

The president said that the constituent assembly was of “illegitimate origin” and therefore would not be recognized.

Sunday’s election of 545 delegates to the assembly will come after nearly four months of political upheaval that resulted in more than 100 deaths and left thousands injured and detained.

Few specifics have been disclosed as to what constitutional changes might be in store for the country. But allies of Venezuelan President Nicolas Maduro said the assembly will target opposition leaders, prompting fears he may use the assembly to install an autocratic regime.