Her withdrawal reflects the energy of the party's left and voters' unease with older candidates and paves the way for Graham Platner to challenge Senator Susan Collins in November.
Defense Secretary Pete Hegseth testified before the Senate Armed Services Committee, facing sharp criticism from Democrats over his handling of the war in Iran and its growing costs.
Senators voted unanimously to prohibit betting practices in the chamber after some users made hundreds of thousands of dollars online by accurately predicting U.S. military actions.