WASHINGTON — The Senate will vote before its August recess on a Republican effort to block federal aid to Planned Parenthood, GOP leaders said Tuesday, as anti-abortion groups clamored for action by lawmakers. Democrats said they will strongly oppose what they called the latest Republican effort to weaken women’s health care programs, but stopped short of flatly predicting its defeat.

The positioning came as an anti-abortion group released a third covertly recorded video of Planned Parenthood officials discussing procedures for obtaining tissue from aborted fetuses for research and showing stark close-ups of what it said was fetal tissue in a Planned Parenthood lab.

“Good luck,” Senate Minority Leader Harry Reid, D-Nev., said of the uphill Republican drive to garner the 60 of 100 Senate votes they will need to cut off Planned Parenthood’s money. “We’re dealing with the health of American women, and they’re dealing with some right-wing crazy.”