The billionaire and Biden have often been at odds over political and labor issues.

A Reuters witness on Friday saw Podesta, Landrieu and Musk entering a downtown building that houses both Tesla's Washington lobbying operation and the Center for American Progress, a think tank Podesta founded. Landrieu and Podesta left about half an hour later and did not answer questions.

Later, White House press secretary Karine Jean-Pierre confirmed the meeting took place and added that Musk did not meet with Biden personally.