Washington (AFP) – A prominent Republican senator introduced a bill on Tuesday that would ban abortion after 15 weeks of pregnancy in all 50 US states. The proposed legislation, which has no chance of passage in the Democratic-held Senate, came under immediate fire from the White House and Democratic lawmakers. Abortion rights have been in the spotlight since the Supreme Court struck down the constitutional right to the procedure in June, leaving the decision on whether to allow it to individual states. The bill proposed by Lindsey Graham, a Republican senator from South Carolina, would make a…