US Republican presidential hopeful Mitt Romney has said he will release recent tax returns on Tuesday.
Mr Romney, the early favourite in primary elections, appeared embarrassed during the South Carolina campaign by the issue of how much tax he paid.
Last week he said he in effect paid 15%, less than most working Americans.
Newt Gingrich won the South Carolina primary on Saturday by an unexpectedly wide margin, beating the former Massachusetts governor by 40% to 28%.
The candidate winning South Carolina has gone on to win the Republican nomination in each election since 1980.
Two other candidates, Rick Santorum and Ron Paul, polled 18% and 13% respectively.
‘Full fair taxes’
Speaking on Fox News Sunday, Mr Romney said the question of tax had become a distraction for his campaign, and he wanted to re-focus on the main issues.
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