Venezuelan opposition leader Juan Guaido was apparently reminded that Washington hasn't forgotten about him after the White House in the last two months began reaching out to the Maduro government in a desire to tap alternative oil supplies given the ongoing war and Ukraine and (at this point partial) European embargo on Russian oil. For a couple of years starting in 2019 as the Trump administration was actively pursuing regime change in Caracas, Guado was in the international media spotlight as US-recognized "interim president". But since then, and through the start of the Biden administration, he's been largely forgotten about.

VOA News reported that "President Joe Biden reaffirmed U.S. support for Juan Guaido during a phone call Wednesday, despite not inviting the Venezuelan opposition leader to the Summit of the Americas, a gathering of leaders from the countries of North, South and Central America and the Caribbean that he is hosting in Los Angeles."

So there are no Maduro government representatives at the LA Summit of the Americas and no 'interim president' Guaido either. On top of that, no top leaders from Mexico, Bolivia, Guatemala, Honduras, and Antigua and Barbuda. 

In its Wednesday evening live network coverage, even CNN admitted the US-hosted Summit of the Americas is already off to an awkward start, given embarrassing situation for the White House that the president of Mexico has boycotted, over the fact that the Venezuelan and other governments run by "dictators" weren't invited.

As for the Guaido phone call, it wasn't even made from the Oval, but while Biden was en route on Air Force One. In a readout, Biden said he stressed "recognition of and support for the 2015 democratically elected National Assembly and Guaido as the interim president of Venezuela," and affirmed support for "Venezuelan-led negotiations as the best path toward a peaceful restoration of democratic institutions, free and fair elections."