Waltz served in the House representing Florida for three terms before his elevation to the White House.

Former President Barack Obama held off on an immediate endorsement, as some in the party have expressed worry that the quick shift to Harris would appear to be a coronation.

President Joe Biden defiantly vowed on Wednesday to keep running for reelection, rejecting growing pressure from within his Democratic Party to withdraw after a disastrous debate performance raised questions about his readiness. He said he would not be forced from the race.