The uncle of senior adviser to the President Stephen Miller said Tuesday that “for reasons that I don’t really know,” Miller has made “his entire political and personal career” about restricting the United States’ immigration policy, of which his own family was a beneficiary last century.

Appearing on CNN’s “New Day” and MSNBC’s “Andrea Mitchell Reports,” David Glosser justified a op-ed he wrote for Politico Magazine that was harshly critical of his nephew.

“If my ancestors had not immigrated to the United States when they did, if they’d waited a few more years until 1924, the door would have been shut,” Glosser told CNN’s John Berman. “My parents would have gone up the crematory chimney, I wouldn’t have been born, my sister wouldn’t have been born and certainly Stephen would never have existed.”

Noting that “dozens” of family members had urged him to speak out, he called the administration’s family separation policy “an act of inexcusable cruelty,” adding: “Had any other country done this in a time of war, it would have been considered a war crime.”

Glosser echoed the sentiment to MSNBC’s Andrea Mitchell: “We appear to have made this decision, and it’s been done in our name as a population, without our consent, and without extreme duress. It seems to have been done thoughtlessly.”

“I shudder at the thought of what would have become of the Glossers had the same policies Stephen so coolly espouses — the travel ban, the radical decrease in refugees, the separation of children from their parents, and even talk of limiting citizenship for legal immigrants — been in effect when Wolf-Leib made his desperate bid for freedom,” he wrote, referring to his and Miller’s refugee ancestors.

“I want to convince people to open their minds and open their hearts to the realities of immigration,” Glosser added on CNN. “The United States is a large country, a wealthy country, and we’ve been made strong and large and wealthy not just by our natural resources and our geographical situation, but by the strength, the smarts, the muscle, the brains and the enterprise of millions of immigrants.”

“We have to realize that there are other people in the world who are facing crises. We can’t solve the entire world’s problems, and solve all the refugee problems in the world, but we should offer help as we can in proportion to our size, our resources, and our abilities.”