Donald Trump Models 'Deportation Force' After Inhumane Eisenhower Plan, Scholar Says

Trump again cites a 1950s immigration plan but promises to "do it humanely."

— -- It was a presidential directive in the 1950s that carried the offensive yet official name of “Operation Wetback.”

Eisenhower’s program managed to deport almost an estimated 1 million Mexican undocumented immigrants, mostly temporary or seasonal workers, on trains, buses, trucks and even cargo ships, according to the U.S. Immigration and Naturalization Service (INS). It’s a program Trump says he will model if elected president, promising MSNBC this morning he will send undocumented Americans home to Mexico using "a deportation force and you're going to do it humanely.”

But a scholar who has studied Eisenhower’s program says it was neither humane, nor effective. “It was a military-style operation,” Mae Ngai, a professor of history at Columbia University in New York, told ABC News. “They swept through Texas and California and also northern states and cities. Rounded people up, put them on planes, trains and ships. It was very aggressive, but it was really only one half of a program.”

Most of the undocumented in the 1950s were temporary or seasonal workers.

“They [the United States] had a duel policy. One hand deported and the other hand legalized,” she said. “They even had a big ‘show,’ allowing them [immigrants] to basically step over the border 18 inches into Mexico and then step back into the U.S. and called it legal re-entry and they did that for thousands of people.”

Despite the INS claim that more than a million Mexicans were deported, that number is contested by historians who say many were counted more than once because they quickly returned to the United States.

“They came back,” Trump said at the debate Tuesday. “Moved them again, beyond the border. They came back. Didn't like it. Moved them way south. They never came back. Dwight Eisenhower. You don't get nicer, you don't get friendlier. They moved a million and a half people out. We have no choice. We have no choice."

But Ngai has a different take.

“It was like a military operation and inhumane. He’s associating with Eisenhower, who was a nice guy, that this was a humane program and that’s false and completely dishonest,” Ngai said.

“They were not really meant to transport people,” Ngai told ABC News. “They were cargo ships and they didn’t refurbish them.”

She added today: “Trump’s idea that you can deport people in military fashion in humane way is false and it didn’t stop the problem. They could not sustain that level of enforcement for two to three years so they just went back to their ordinary enforcement, which was ineffective.”

On Fox News Wednesday night, Trump said "I do but I wouldn’t use the term. I don’t like the term. " when host Bill O'Reilly alluded to the program's name. He went on to defend the program itself.