Both Ted Cruz and John Kasich have fallen by the wayside, while Donald Trump dashed to the finishing line of Republican Party nomination for the US presidential race in 2016.

Ohio Governor John Kasich has dropped out of the presidential race after struggling to gain traction against Republican front-runner Donald Trump, US media report.

Republican Donald Trump took aim at rival John Kasich's table manners Monday, labeling his eating "disgusting" and calling him "a stubborn guy who eats like a slob."