SANFORD, FLORIDA (Reuters) - Democratic presidential nominee Hillary Clinton, called on Republican rival Donald Trump to release his 2015 tax returns, telling supporters in Sanford, Florida that Trump is the "poster boy for everything that is wrong with our economy".

Mrs Clinton said, "He has no excuse because his 2015 taxes are not even under audit."

"I think the American people deserve to know whether he paid any penalty for skirting the law, and how much he is actually worth, and who he does business with, I'm particularly interested in in the Russian business deals," Mrs Clinton said.

A week before Election Day, the Clinton campaign was trying to contain damage from the announcement by FBI Director James Comey on Friday (Oct 28) that his agency was looking into new emails that might relate to Clinton's use of a private server while she was secretary of state.

Mr Trump and other Republicans seized on Comey's announcement, which did not indicate any wrongdoing by Mrs Clinton, to ratchet up criticism of the Democratic candidate.

Opinion polls show Mrs Clinton's lead has narrowed slightly since early last week but it is too early to say if the e-mail controversy is hurting her.

Mrs Clinton led Mr Trump in the latest Reuters/Ipsos poll of likely voters on Monday, by 44 per cent to 39 per cent.