NEW YORK - The abortion bill most likely to become federal law this year would affect a relatively small number of pregnant teens, yet its impact on them could be dramatic - sharply reducing the options for girls in many states who dread telling their parents of their plight.

Supporters and opponents each offer vivid worst-case scenarios in debating the bill, which was included last week in the Senate Republicans' priority list. It would outlaw transporting a minor across state lines to obtain an abortion in order to evade parental consent or notification laws in the girl's home state.