Opposition leader Juan Guaido faces a key test of support after calling for the "largest march" in Venezuela's history to try to dislodge President Nicolas Maduro, even as the military has so far resisted calls to help remove him.

Venezuela's opposition leader Juan Guaido will be barred from public office for 15 years, the government comptroller says, as it seeks to crack down on the US-backed rival to President Nicolas Maduro.