Former House Speaker Newt Gingrich unveiled his latest ad Thursday attacking Mitt Romney for his flip flops on the abortion issue.

Images of a Romney flash across the screen as a female narrator accuses him of switching from an anti-abortion position to supporting abortion rights.

"What happened after Massachusetts moderate Mitt Romney changed his position from pro-abortion to pro-life?" the narrator asks. "He governed pro-abortion."

"Romney appointed a pro-abortion judge, expanded access to abortion pills, put Planned Parenthood on a state medical board but failed to put a pro-life group on the same board," she continues. "And Romney signed government-mandated health care with taxpayer-funded abortions. Massachusetts moderate Mitt Romney: He can’t be trusted."