White House sources reportedly stated Machado committed the 'ultimate sin' by accepting the award, despite her dedicating it to Trump.
The Nobel committee clarified that a Nobel Peace Prize cannot be transferred, revoked, or shared once announced, with the decision being final.
Machado, an industrial engineer and political activist, won Venezuela's opposition primary in 2023 but was subsequently banned from running for president against Nicolas Maduro.
Her political activism has led to significant personal and professional challenges, including the detention or forced departure of her senior advisers.