Debate tips

An ex-FBI interrogator's tips on handling debate lies

Plenty of half-truths (and outright non-truths) were uttered during the Clinton-Trump debate last week, and Tuesday's Kaine-Pence head-to-head saw outright denial of statements that had been made on the record - and on camera.

ABC's Martha Raddatz and CNN's Anderson Cooper, who will moderate the second presidential debate on Sunday, face a sizeable challenge. Will they manage to respond correctly to any lapses in truth-telling by the candidates?

One man has some advice for them.