Representative Rick Lazio (R-NY) (L) walks over and challenges rival U.S. Senatorial candidate Hillary Clinton to sign a Freedom from soft money pact during their first 2000 Senatorial Debate in Buffalo, New York, U.S., September 13, 2000. REUTERS/Richard Drew/Pool/File Photo

Republican presidential candidate and Texas Governor George W. Bush (R) and Senator Judd Gregg from New Hampshire (L) practice with Bush staff members for upcoming presidential debates against Vice President Al Gore, at Bush's ranch in Crawford, Texas, U.S., September 30, 2000. REUTERS/Jeff Mitchell/File Photo

Democratic U.S. presidential candidate and Senator Bernie Sanders (L) and former Secretary of State Hillary Clinton speak simultaneously as they discuss issues during the Democratic presidential candidates debate sponsored by MSNBC at the University of New Hampshire in Durham, New Hampshire, U.S., February 4, 2016. REUTERS/Mike Segar /File Photo

2016 Rio Paralympics - Swimming - Women's 50m Backstroke - S5 - Aquatic Stadium - Rio de Janeiro, Brazil - 16/09/2016. Teresa Perales of Spain reacts REUTERS/Sergio Moraes

Rosario Rocca, mayor of Benestare, poses in the council hall in Polistena, Calabria, Italy June 24, 2016. The 'Ndrangheta burned Rocca's car who said of his town, "The state is absent". REUTERS/Tony Gentile

Mayor of Calimera, Francesca De Vito, poses in the council hall of Polistena, Calabria, Italy June 24, 2016. De Vito found an envelope containing two bullets, in front of the town hall. REUTERS/Tony Gentile

A woman watches as younger generations attend a march against mafia violence in Polistena, Calabria, Italy June 24, 2016. REUTERS/Tony Gentile

A man with a banner reading "the mayors need solidarity, not threats" attends a march against mafia violence in Polistena, Calabria, Italy June 24, 2016. REUTERS/Tony Gentile