Washington (CNN) President Donald Trump pledged more action to ramp up pressure on Venezuela's embattled President Nicolas Maduro during a White House meeting Wednesday with Juan Guaido, the Venezuelan opposition leader who is recognized by the US and more than 50 countries as Venezuela's interim president, a source familiar with the meeting said.

Meeting in the Oval Office, Trump told Guaido there would be new US government actions concerning Venezuela in the next month, the source said, although it wasn't immediately clear what those actions might be. The US has been mulling additional sanctions targeting Russia for its ongoing oil purchases from Venezuela and the source said Guaido hoped Trump was referring to impending action on that front.

An administration official confirmed that additional action is coming but declined to detail what the next step will be.

Trump's meeting with Guaido came at a crucial time for the Venezuelan opposition leader, whose efforts to unseat Maduro have faltered in recent months.

Guaido left his meeting with Trump feeling "upbeat, thinking this will help him regain momentum on the ground" in Venezuela, according to one source. But Guaido is also aware that he needs to move fast.

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