The Trump administration is trying to cut Venezuelan president Nicolás Maduro's revenue streams, US National Security Adviser John Bolton says.
The comments come one day after Maduro cut diplomatic ties with the US on Thursday, according to a BBC report.
Maduro was angry after they recognised an opposition figure, Juan Guaidó, as interim president on Wednesday.
Bolton told reporters outside the White House the issue was "complicated" but they were working on a plan to funnel funds to Guaidó instead.
Figures from the Trump administration are continuing to try and compound pressure on Maduro as the international community remains divided in its support of him.
Russia has condemned foreign powers for backing Guaidó, saying the move violated international law and was a "direct path to bloodshed".
Mike Pompeo, the US Secretary of State, has now requested a UN Security Council meeting be held on the issue on Saturday.
At a meeting of the Organisation of American States (OAS) on Thursday he described Maduro's government as "morally bankrupt" and "undemocratic to the core".
President Trump has said that "all options are on the table" in response to the unrest.
How did the row develop?
Large protests were organised against, and some in support of, Maduro on Wednesday.
At one demonstration in Caracas, Guaidó, Venezuela's National Assembly leader, declared himself as the country's interim leader.
He said articles within the country's constitution allow him to assume interim power because he believed Maduro's election, and therefore presidency, was invalid.
He has vowed to lead a transitional government and hold free elections.
Within minutes of his declaration, Trump recognised Guaidó as the country's legitimate head of state. A number of South American nations, as well as Canada and the UK, have now followed suit.
The government of Maduro, who has maintained the military's support, described Guaidó's actions as an attempted coup.
Maduro has labelled the US comments a "big provocation" and broken off diplomatic relations.
On Thursday, he ordered the closure of Venezuela's embassy and consulates in the US.
The US state department meanwhile has ordered non-essential staff to leave Venezuela.
Maduro's sovereignty has been backed by China and Russia, who both have strategic interests in his country's economy.
Others, including Mexico and Turkey, have also stood by Maduro.
A Caracas-based NGO, the Observatory of Social Conflict, says that at least 26 people have been killed in demonstrations so far this week.
