Mr Guaido said “all necessary options” are on the table just days after he launched a failed military coup attempt to topple the embattled leader after months of chaos in the oil-rich nation. US-backed Mr Guaido had called on the Venezuelan military to rise up against the president but support was minimal and two days of protests followed in which four people were killed and hundreds injured. Mr Guaido 35, told BBC News: “I, as the president in charge of the national parliament, will evaluate all necessary options.”
He has been recognised as the country’s legitimate leader by more than 50 states.
Mr Guido denied the botched coup damaged his reputation as a leader, saying: “I think the only one that really hurts himself is Maduro.
“He has been losing again and again, is increasingly weak, increasingly alone, has no international support.”
US President Donald Trump has already said that “all options are on the table” when it comes to dealing with the disastrous political situation in Venezuela.
An estimated 5.3 million people will have fled Venezuela by the end of 2019, the United Nations predicts.
Socialist President Nicolas Maduro, 56, thanked the military for ignoring Mr Guaido’s call to overthrow him, branding it an “imperial” plot.
But Mr Guaido denied that the president enjoys the support of his military chiefs, saying only “part of them, not all” were in favour of him remaining in power.
He described Mr Trump’s stance on the country’s political situation as “very firm”, something which he said he, his country and the the international community “appreciate”.
Moscow has stood behind Mr Maduro as he faced fierce opposition from within and outside Venezuela.
Mr Trump told reporters on Friday that Russian President Vladimir Putin had expressed his desire to avoid meddling in Venezuela during a phone call between the two leaders.
Mr Trump said: “He is not looking at all to get involved in Venezuela, other than he’d like to see something positive happen for Venezuela.”
But the Russian Embassy in Washington said the phone call had been initiated by Mr Trump, not Mr Putin.
In a statement posted on Facebook, the embassy said Mr Putin had “underscored that only the Venezuelans themselves have the right to determine the future of their country, whereas outside interference in the country’s internal affairs and attempts to change the government in Caracas by force undermine prospects for a political settlement of the crisis.”