(FILES) This file photo combination shows Democratic presidential candidate Hillary Clinton(L) on April 4, 2016 and Republican challenger Donald Trump on February 16, 2016. November’s US presidential election is taking shape: Republican billionaire Donald Trump and Democratic power player Hillary Clinton look set for an ugly battle for the White House after a bruising primary season. Trump knocked out his only serious challenger Ted Cruz on May 3, 2016 in Indiana’s key primary, winning 53 percent of the vote against 37 percent for the Texas senator, who raised the white flag and surprisingly pulled out of the race. / AFP PHOTO / dskDSK/AFP/Getty Images