The Republican candidates say more must be done to combat illegal immigration. The topic was a natural for Wednesday night's debate in Mesa, Ariz ... The Republican presidential candidates are trying to avoid a debate on contraception and instead are looking to keep the focus of their criticism on President Barack Obama ... Mitt Romney and Rick Santorum are clashing on spending requests during a sharp confrontation that fellow Republican Newt Gingrich calls "silly" as the Republican presidential contenders' debate ... Rick Santorum is on the defensive at the GOP presidential debate, taking criticism from GOP opponents who say he's not a fiscal conservative ... MESA, Arizona (Reuters) - Rivals heaped criticism on surprise front-runner Rick Santorum in a debate among Republican presidential candidates on Wednesday, hoping to stall his surge at a pivotal period in the 2012 campaign ... MESA, Arizona (Reuters) - Rivals piled criticism on U.S. presidential candidate Rick Santorum at a testy debate on Wednesday, attempting to blunt his surprise surge at a pivotal period in the Republican race ... MESA, Arizona (Reuters) - U.S. Republican presidential candidates Mitt Romney and Newt Gingrich on Wednesday lent their support to the idea of arming the Syrian opposition in its fight to topple President Bashar al-Assad ... Mitt Romney and Rick Santorum clashed on stage in Arizona during what could be one of the final debates of the Republican nomination battle ... Notable moments from the GOP presidential debate Wednesday night in Mesa, Ariz ... | 
