Kennedy denounced Trump’s zero-tolerance policy in a statement and said his executive order ending migrant family separation was not going far enough to rectify what has happened.

“Generations of Americans did not toil and sacrifice to build a country where children and their parents are placed in cages to advance a cynical political agenda,” Kennedy said.

The Kennedy family members participating plan to fast for 24 hours and make a donation equal to the value of the food they would have eaten during the duration of the 24-hour hunger strike.

Massachusetts Democratic Rep. Joe Kennedy III, the grandson of Robert and Ethel, is also participating in the fast.

“For children being starved of contact with their parents, the irreparable harm inflicted by our government multiplies every single day kids remain separated from their moms and dads,” he said in a statement. “Through the Break Bread Not Families Fast, we hope to underscore the urgency our nation faces to confront this moral crisis perpetuated within our shores.”