Sen. Cory Booker of New Jersey publicly called for the removal of Senate Majority Leader Chuck Schumer, marking a rare open challenge to party leadership and setting off internal conflict within the Democratic Party. Booker made the remarks during a televised appearance, initiating what several lawmakers described as an unprecedented public break from standard intra-party practice. Booker’s comments signaled dissatisfaction with current leadership and represented a shift from the typical private discussions that accompany leadership disputes. He called for new leadership within the Senate Democratic caucus. The statement was delivered openly and immediately drew attention among Democratic lawmakers in Washington....