FILE: Vice President-elect Kamala Harris speaks as she and President-elect Joe Biden introduce their nominees and appointees to key national security and foreign policy posts at The Queen theater, in Wilmington, Del. .
And then she will make a formal announcement on Monday," said a Harris aide, The Hill reported on Sunday.
VICE PRESIDENT-ELECT HARRIS WILL BE SWORN IN BY JUSTICE SONIA SOTOMAYORAs vice president, Harris will be poised to cast any tie-breaking votes in the Senate that will be split 50-50 after Democrats Jon Ossoff and the Rev