A real fight is brewing inside the Democratic Party over who should lead Senate Democrats, and it's bad news for Chuck Schumer.

• Bernie Sanders publicly said he won't back Schumer for another term as Senate Democratic leader, pushing for a "new and bold direction" after 36 years working alongside him.
• Chris Van Hollen is quietly gauging support for a leadership challenge, drawing interest from a wide range of senators, from progressive to moderate.
• The split tracks a bigger divide: some Democrats want fighters who clash with Trump's administration, while establishment figures like John Fetterman are sticking with Schumer.
• Separately, Van Hollen and other Democrats are pushing to use the upcoming government funding deadline as leverage to stop Trump from escalating the war with Iran, though leadership (Hakeem Jeffries, Patty Murray) has been vague about committing to that fight.
• The same dynamic is playing out for Hakeem Jeffries' hold on House leadership, as newer, more combative members question the old guard.

Outlook: The leadership fight will likely come to a head around the December 11 government funding deadline, testing whether Schumer's past private commitments from colleagues actually hold.