Former Florida governor and Republican presidential candidate said the majority of illegal immigrants are coming from Central America, not Mexico, and Donald Trump is proposing to build "a wall that can't be built."

"He wants everyone deported, which would tear family lives asunder," Bush said to host John Catsimatidis on "The Cats Roundtable" on AM 970 in New York. Bush added that Trump's plan to end birthright citizenship, a right currently guaranteed by the 14th Amendment, "would probably be unconstitutional."

"What Donald Trump is proposing is a wall that can't be built, and if it was, it would cost hundreds of billions of dollars," said Bush of the Republican front-runner's plan. Trump has said he "will build a great, great wall on our southern border and I will have Mexico pay for that wall."

"It's not conservative and it's not realistic and it does not embrace American values," Bush said of Trump's proposed immigration policy.

Trump and Bush have traded barbs on a host of issues, from immigration to women's health, with the Donald most recently calling Jeb a "low energy" candidate. Bush refrained from a counter-punch Sunday, instead acknowledging Trump's appeal, but saying the real estate tycoon is not offering any compelling proposals.

Trump connects with "people's anxiety about what the future looks like," said Bush.

Trump's focus on Mexico is inappropriate since the majority of illegal immigrants in the United States are from Central America, not Mexico, Bush said.

"Right now the number of Mexicans crossing the border is basically flat," he said. "The immigrants that are crossing legally or illegally in both cases are from Central America now. It changes."

Despite the fluctuation in where immigrants hail from, Bush said "what shouldn't change is our commitment to respecting the rule of law and our commitment to support the security of our borders."