Jeb Bush begins challenging Donald Trump head on

Republican presidential candidate Jeb Bush has escalated his feud with Donald Trump, betting that he can re-energise his stalled campaign by challenging the billionaire businessman head on.

It’s a risky strategy for the former Florida governor, still considered the GOP frontrunner by many party officials, but a move his advisers suggest is necessary to reverse Trump’s unlikely ascension to the top of the 2016 presidential class.

Bush intensified his criticism of the ex-reality TV star on multiple fronts, first releasing a video featuring clips of Trump himself promoting traditionally liberal positions in old interviews.