Senate Minority Leader Chuck Schumer (D-NY) reiterated Sunday that Democrats will not accept an extremist on the Supreme Court. “If the nominee is not bipartisan and mainstream, we absolutely will keep the seat open,” Schumer told CNN’s “State of the Union.” […] Schumer said he is prepared to fight "tooth and nail" should Trump not choose a mainstream nominee. Former President Barack Obama had nominated Merrick Garland to fill the vacancy.