David Cameron
The former US president said he could "encourage" Russia to attack Nato allies.
Troops are expected to advance to the densely-populated southern city of Rafah.
The Palestinian ambassador to the UK called the comments the "best shot in the arm".
The foreign secretary sidestepped plenty of questions from the Foreign Affairs Select Committee on Tuesday.
Foreign secretary tells MPs he is "worried" Israel is breaking international humanitarian law.
Tory leader changes election strategy, billing himself as a continuity candidate after saying "change" 30 times in his October conference speech.
House Of Cards author Michael Dobbs presses foreign secretary David Cameron to "reforge and strengthen" relations with Greece.
"The King is flanked at the summit by two men who remain committed to climate-wrecking policies," ActionAid says.
"I leave all classical allusions to another former prime minister," said the freshly-minted Lord Cameron of Chipping Norton.
Lord Cameron of Chipping Norton dons the ermine robes to seal his political comeback.
About David Cameron
David Cameron took office in 2010 after forming a coalition government with Nick Clegg. He has since seen the popularity of his party fall as well as internal rebellions against the alliance with the Lib Dems.