(CNN) As the US continues to work to bolster the administration of self-declared interim Venezuelan President Juan Guaido -- including using US military aircraft to deliver humanitarian aid -- a senior administration official says the US would be willing to meet with Nicolas Maduro to negotiate his exit.

Maduro reportedly extended an invitation to the US special envoy on Venezuela, Elliott Abrams, to meet with him. The State Department and Secretary of State would not comment on the prospect of such a meeting, but Mike Pompeo said Friday that the overture shows Maduro's "increasing understanding that the Venezuelan people are rejecting him."

Adding to the pressure campaign against the Maduro regime, the US Treasury Department announced sanctions against five individuals who are, as described by Secretary Steven Mnuchin, "in charge of Maduro's security and intelligence apparatus, which has systematically violated human rights and suppressed democracy, including through torture and other brutal use of force."

Meanwhile, three defense officials tell CNN that US military aircraft will help ferry humanitarian aid to countries neighboring Venezuela in the hopes that the aid might be delivered to the Guaido administration.

US Air Force C-17 aircraft will support the US State Department and the US Agency for International development, flying the aid from the continental United States to Colombia.

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