Chelsea Clinton announces birth of second child Aidan

US: Chelsea Clinton, daughter of former US president, Bill Clinton and presumptive Democratic nominee Hillary Clinton has announced the birth of their second child Aidan Clinton Mezvinsky on Saturday.

In a Twitter statement, Chelsea wrote;

 “Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky,”

In a statement by Bill and Hillary Clinton, it read,

 ''thrilled to be grandparents again''

"We are all over the moon as Chelsea and Marc welcome Charlotte's little brother to the world and grateful for our many blessings," the statement read. "Chelsea and Aidan are both doing well and enjoying this very special time together."

Chelsea is the only child of  Bill and Hillary Clinton. Chelsea had her first child, Charlotte Clinton Mezvinsky, in September 2014. Clinton has been on the campaign train woth her mother this year,