US presidential hopefuls are to make final pitches to people in Iowa, where the first votes for party nominations will take place later on Monday.
Polls suggest that Republican Donald Trump has a narrow lead over Ted Cruz but both are well ahead of the others.
But the Democratic race is slightly tighter, with former US Secretary of State Hillary Clinton edging ahead of Vermont Senator Bernie Sanders.
Each party's nominee will contest the presidential election in November.
Over the weekend, the candidates barnstormed the sparsely populated Midwestern state of Iowa in an attempt to court undecided voters.
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