Donald Trump on Thursday secured the support of enough delegates to clinch the Republican presidential nomination, after unbound delegates pledged to back the billionaire, according to the Associated Press count. The Republican Party will not make the results official until its national convention in July, when delegates actually cast their votes for the nominee. The party does not provide an official delegate count throughout the primary race, leading several US news organizations to compile their own estimates. There are slight discrepancies between different counts because in some states delegates are free to vote for the candidate of their choice, unbound by the primary results. Trump has now secured the backing of 1,238 delegates, one more than the 1,237 needed, according to the AP, which said the New York real estate tycoon passed the threshold when a small number of unbound Republican delegates, including Oklahoma GOP chairwoman Pam Pollard, said they would support...