The Charity Commission has requested evidence from the US Senate in the wake of further allegations that George Galloway received funds from the Iraqi oil-for-food programme through the Mariam Appeal, the charity he set up in 1998.
"We've asked the Senate Committee to provide the underlying evidence for its second report," said Antony Robbins, head of communications at the commission. "We will see if there is any basis for further action."
However, the commission has denied reports that it is reopening an investigation into Galloway's activities linked to the Mariam Appeal.
The original investigation into payments made by the charity was closed last year after it concluded that the monies in question were spent appropriately.
In its second report, the US Senate Permanent Subcommittee on Investigations claims that Galloway received $446,000 (£252,700) or more through the appeal.