The anti-abortion group Operation Rescue has told its supporters it is facing a “major financial crisis” and is close to shutting down unless emergency help arrives soon. Troy Newman, the group’s president, blamed the economic downturn for its money woes in an plea e-mailed to donors. The organization, based in Wichita, has also been under attack from both fringe anti-abortion militants and abortion rights supporters since the May 31 shooting death of Dr. George Tiller, an abortion provider in Wichita.