Democratic presidential candidate U.S. Senator Hillary Clinton (D-NY) (L), with her daughter Chelsea at her side, talks to supporters preparing to canvass for her in Manchester, New Hampshire January 6, 2008. REUTERS/Brian Snyder

Former U.S. President Bill Clinton (C) and his daughter Chelsea (L) listen as his wife U.S. presidential candidate Sen. Hillary Rodham Clinton (D-NY) speaks at a fundraising rally in New York April 23, 2007. REUTERS/Keith Bedford

Hillary Clinton smiles with her daughter Chelsea during her confirmation hearing before the Senate Foreign Relations Committee on Capitol Hill in Washington to become the next U.S. Secretary of State January 13, 2009. REUTERS/Yuri Gripas

Former U.S. President Bill Clinton and daughter Chelsea share a moment during the dedication ceremony for the William J. Clinton Presidential Center in Little Rock, November 18, 2004. REUTERS/Jeff Mitchell JM - RTRG37U

US Secretary of State Hillary Clinton (L) is joined by her husband former US President Bill Clinton and daughter Chelsea Clinton as she is ceremonially sworn in at the State Department in Washington, February 2, 2009. REUTERS/Jonathan Ernst

Chelsea Clinton, daughter of former U.S. President Bill Clinton, speaks to Rosita the muppet during the Clinton Global Initiative (CGI) in New York September 24, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson

United States president Bill Clinton stands with his arms around wife Hillary Rodham Clinton (L) and daughter Chelsea (R) after he addressed delegates at the Democratic National Convention August 14, 2000 at the Staples Center in Los Angeles. REUTERS/Andy Clark - RTR79BW

Democratic U.S. presidential candidate Hillary Clinton stands onstage with her husband former President Bill Clinton (L) and her daughter Chelsea (R) after speaking during her California primary night rally held in the Brooklyn borough of New York, U.S., June 7, 2016. REUTERS/Shannon Stapleton - RTSGHLT

US Democratic presidential candidate Sen. Hillary Clinton (D-NY) laughs with her daughter Chelsea (R) as California Lt. Governor John Garamendi (not pictured) talks about Hillary planning a birthday party for her daughter before she addressed the crowd about America's economy at the IBEW Local 11 Electrical Training Institute in Commerce, California just outside of Los Angeles, January 11, 2008. REUTERS/Danny Moloshok