Front-runner Donald Trump tried to prove no perceived misstep can derail his march to the Republican presidential nomination.

Republican front-runner Donald Trump has vowed to continue his abrasive presidential campaign rhetoric, rejecting any responsibility for violence at his rallies and defending supporters accused of attacking protesters.

A 20-year-old man’s Twitter posts sympathising with Islamic terrorists led to an undercover FBI operation and the man’s arrest on charges that he plotted to blow up the US Capitol and kill government officials.

President Barack Obama and Republican rival Mitt Romney launched a frenzied final weekend of campaigning today seeking an edge in a handful of battleground states that will decide the outcome of a tight presidential race that is going down to the wire.