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Jae C. Hong, Associated Press
Former Texas Gov. Rick Perry, center, bites his lips as he gets up to introduce Republican presidential candidate, Sen. Ted Cruz, R-Texas, left, at a campaign event at High Point Bulls Oswald Barn, Tuesday, Jan. 26, 2016, in Osceola, Iowa.

DES MOINES, Iowa — Republican Donald Trump is breaking from his reputation as a flamethrower with just days to go before Iowa's leadoff caucuses.

The billionaire businessman is promising to get things done in Washington. That's a direct contrast to leading GOP rival Ted Cruz, the Texas senator whose brief Washington career has been defined by obstructing even his own party.

Trump's can-do message comes as his adversaries pour money into attack ads questioning his commitment to conservative values.

Cruz allies have put up no fewer than six anti-Trump ads in recent days, spending several million dollars in Iowa and South Carolina.

Also, Katie Packer, a senior aide to Mitt Romney's 2012 campaign has started a super PAC that's spending hundreds of thousands of dollars on an anti-Trump campaign in Iowa.