Trump aims to end birthright citizenship, says American citizens with family here illegally may be deported

 This is why Trump can't strip people of their citizenship.

The Fourteenth Amendment to the United States Constitution is a Reconstruction Amendment that grants citizenship and equal rights to all people born or naturalized in the United States

To repeal an amendment to the constitution requires a 2/3 vote by both Houses of Congress and approval by 2/3 of the states. Republicans don't hold a large enough majority in either House to win approval. Like wise they don't control enough states to reach the 2/3 threshold as required by the constitution. 

Further Donald Trump through executive action can't suspend or repeal any part of the constitution he disagrees with. 

On birthright citizenship, Trump said he would seek to repeal it via executive action — which would be certain to spark immediate legal challenges.

“We have to end it,” Trump said, calling it “ridiculous.”

Trump suggested that birthright citizenship is uniquely American, saying, “We’re the only country that has it, you know.” But according to a review by the Library of Congress, more than 30 nations provide birthright citizenship, including Canada and Brazil.