Four recent polls show Donald Trump trailing retired neurosurgeon Ben Carson in Iowa. Still, the outspoken billionaire told voters at a town hall Monday he's confident he's still ahead.

"I don't believe I did fall behind [Carson]," Trump told ABC's Matt Lauer at the event in Atkinson, N.H. He noted that just last week, thousands of supporters attended one of his signature Make America Great Again rallies in Iowa.

Nevertheless, a Des Moines Register/Bloomberg Politics poll released last Friday showed Carson soaring to 28 percent support among likely Republican caucus-goers in Iowa while Trump fell to 19 percent.

"The Des Moines Register is a terrible paper," Trump told Lauer.

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