Top Republicans are divided on whether to support Donald Trump after the businessman all but secured the party's presidential nomination.
Republican presidential front-runner Donald Trump suggested that Rafael Cruz, his chief opponent's father, is connected to the man who killed President John F Kennedy.
For Americans of nearly every race, gender, political persuasion and location, disdain for Donald Trump runs deep, saddling the Republican front-runner with unprecedented unpopularity as he tries to overcome recent campaign setbacks.
Some people run simply out of ego or greed. The publicity that attends a presidential bid can garner even a failed candidate a book contract, a television gig, or a well-paid speaking career (or perhaps all three). Trump ran on the basis of his celebrity.
Donald Trump trains his fire on the protesters disrupting his rallies, branding them "thugs" and extremists, as White House rivals warned the Republican's heated rhetoric was dangerously fanning tensions.
Donald Trump calls off a rally in Chicago after protests against the Republican presidential front-runner led to violent clashes.
The Grand Old Party does not know how to stop Trump and it is their fault. Throughout history it's a party that has won elections mostly on anti-government rhetoric.
When Republican frontrunner Donald Trump offered a provocative retort to criticism by Pope Francis, it may have been a calculated political move to boost his standing ahead of South Carolina's presidential primary.