Former Trump campaign chair Paul Manafort was sentenced on Thursday to nearly four years in prison for tax and bank fraud related to his work advising Ukrainian politicians, much less than what was called for under sentencing guidelines.

Manafort, sitting in a wheelchair as he deals with complications from gout, had no visible reaction as he heard the 47-month sentence.

While that was the longest sentence to date to come from special counsel Robert Mueller's probe, it could have been much worse for Manafort.

Sentencing guidelines called for a 20-year-term, effectively a lifetime sentence for the 69-year-old.

Manafort has been jailed since June, so he will receive credit for the nine months he has already served. He still faces the possibility of additional time from his sentencing in a separate case in the District of Columbia, where he pleaded guilty to charges related to illegal lobbying.

'Humiliated'

Before Judge TS Ellis III imposed the sentence, Manafort told him: "Saying I feel humiliated and ashamed would be a gross understatement." But he offered no explicit apology, something Ellis noted before issuing his sentence.

Manafort steered Donald Trump's election efforts during crucial months of the 2016 campaign as Russia sought to meddle in the election through hacking of Democratic email accounts.

He was among the first Trump associates charged in the Mueller investigation and has been a high-profile defendant.

But the charges against Manafort were unrelated to his work on the campaign or the focus of Mueller's investigation: Whether the Trump campaign co-ordinated with Russians.

A jury last year convicted Manafort on eight counts, concluding that he hid from the IRS millions of dollars he earned from his work in Ukraine.

Manafort's lawyers argued that their client had engaged in what amounted to a routine tax evasion case, and cited numerous past sentences in which defendants had hidden millions from the IRS and served less than a year in prison.

Prosecutors said Manafort's conduct was egregious, but Ellis ultimately agreed more with defence attorneys. "These guidelines are quite high," Ellis said.

Neither prosecutors nor defence attorneys had requested a particular sentence length in their sentencing memoranda, but prosecutors had urged a "significant" sentence.

Outside court, Manafort's lawyer, Kevin Downing, said his client accepted responsibility for his conduct "and there was absolutely no evidence that Mr Manafort was involved in any collusion with the government of Russia".

Prosecutors left the courthouse without making any comment.

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