The number of babies born in United States to undocumented immigrants declined from a peak of 370,000 in 2007 to about 295,000 babies in 2013, according to estimates released Friday by the Pew Research Center.

The number of babies born in 2013 represents eight percent of the births that year, compared to nine percent in 2007.

The 14th Amendment to the Constitution grants citizenship to anyone born in United States regardless of the immigration status of their parents. In recent years, some politicians have called to repeal birthright citizenship, including Republican presidential front-runner Donald Trump.

A Pew Research survey in February 2011 revealed that 57 percent of Americans opposed changing the Constitution to end birthright citizenship, while 39 percent favored such change.