WASHINGTON (AP) — Republican Sen. Lindsey Graham has introduced a bill calling for a nationwide abortion ban. The bill would prohibit abortions after 15 weeks of pregnancy, except in cases of rape, incest or danger to the physical health of the mother. The legislation introduced Tuesday is sending shockwaves through both parties with just weeks before voters go to the polls. Graham’s own Republican colleagues did not immediately embrace his abortion ban bill, which has almost no chance of becoming law in the Democratic-held Congress. Democrats reject it as extreme and an alarming signal of where Republicans are headed if they win control of the House and Senate in November.