Sinn Fein has offered to open up its finances for scrutiny in order to counter claims that US funding to the party is siphoned to other channels.
The Sinn Fein chairman, Mr Mitchel McLaughlin, yesterday said "every single dollar" raised by the party in the US was documented in accounts.
"There's the most rigorous accountancy systems insisted upon by financial authorities in the United States.
"They will actually see precisely how much money was raised. They will also be able to see precisely how that money was used," he added.
His comments came as political parties in Northern Ireland were last night granted an exemption for four years from strict new British legislation banning foreign donations and identifying donors behind large contributions.
The British Government secured the exemption after a House of Commons vote of 304 in favour and 123 against.
Speaking at a late sitting, the Northern Ireland Minister, Mr George Howarth, stressed the exemption could also be revoked.
He also conceded the exemption would have to be reviewed if the Irish Government went ahead with plans for a similar ban on donations.
The exemption means Northern Ireland donors will not be identified and this would protect against any security risks. It will also enable the SDLP and Sinn Fein to continue raising funds on an all-Ireland basis and from abroad.
An NIO source last night said the fact that parties could still receive funds from abroad was an "unfortunate consequence" of the British Government's acknowledgement of the special role of the Republic in the political life of the North.