All four living former first ladies are showing a united front against the Trump administration’s zero tolerance policy toward illegal border crossings that has resulted in family separation after former first lady Rosalynn Carter on Monday issued a rare public statement.

“When I was first lady, I worked to call attention to the plight of refugees fleeing Cambodia for Thailand. I visited Thailand and witnessed firsthand the trauma of parents and children separated by circumstances beyond their control,” Carter wrote in a statement released by the Carter Center. “The practice and policy today of removing children from their parents’ care at our border with Mexico is disgraceful and a shame to our country.”