Top Democrat demands six years of Trump's tax returns

US President Donald Trump has refused to release his tax returns, raising speculation among critics about his revenue sources and net worth. [AFP]

A top Democrat formally requested Wednesday that the US tax agency provide Congress with President Donald Trump's tax returns, setting up a likely legal battle with the White House.

Richard Neal, chairman of the House Ways and Means Committee which writes tax law, wrote the Internal Revenue Service seeking six years of Trump's returns, saying he was using his oversight authority to learn the extent to which the IRS audits and enforces tax laws on a sitting president.