Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

US Republican presidential candidate Donald Trump speaks at a rally at Liberty University in Lynchburg, Virginia, January 18, 2016.  / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US Republican presidential candidate Donald Trump speaks at a rally at Liberty University in Lynchburg, Virginia, January 18, 2016.  / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

    JUST WATCHED

    Trump's counterpunch strategy

MUST WATCH

Trump's counterpunch strategy

Donald Trump's strategy has been to counterpunch -- but is it effective? CNN's John Berman looks back at some examples.

Trump's counterpunch strategy

Donald Trump's strategy has been to counterpunch -- but is it effective? CNN's John Berman looks back at some examples.