Donald Trump remains standing at the front of the stage as rivals Marco Rubio, Ted Cruz and John Kasich head to their podiums in Detroit. REUTERS/Jim Young

Hillary Clinton and Donald Trump. REUTERS/Lucy Nicholson (L) and Jim Urquhart

Bernie Sanders and Hillary Clinton speak simultaneously as they discuss issues during the Democratic presidential candidates debate in Durham, New Hampshire. REUTERS/Mike Segar

Donald Trump shows off the size of his hands as rivals Marco Rubio, Ted Cruz and John Kasich look on at the start of the Republican presidential candidates debate in Detroit. REUTERS/Jim Young

Donald Trump attends a church service in Detroit, Michigan. REUTERS/Carlo Allegri

A visitor walks past an escalator at the Printemps department store in a shopping district in Paris, France, November 23, 2015. REUTERS/Eric Gaillard

A customer holds a shopping basket inside a Casino shop in Nice, France, January 14, 2016. REUTERS/Eric Gaillard

New York Governor Andrew Cuomo (R), walks with his aide Joseph Percoco (L) in the Hall of Fame before meetings at the Hotel Nacional in Havana, Cuba, on April 20, 2015. REUTERS/Ramon Espinosa/Pool/File Photo