What did the Channel 4 report show?published at 09:45 BST
In the Channel 4 report, which aired on Thursday night, undercover filming showed Nigel Farage's senior aide, Dan Jukes, suggesting a way to get around electoral law to secure a foreign donation of £500,000 for Reform.
The undercover filming was carried out by a group called Verbatim Investigations, which was founded by journalists from the Centre for Climate Reporting. Channel 4 News say they have verified the material they were given and chose to broadcast.
The footage includes a discussion over a lunch, where a reporter posed as a UK-based son and an actor pretended to be his American father. Opposite them are both Jukes and Nigel Farage.
Farage says "it's all above board" after the son has told him he has been in discussions with both Jukes and Reform's policy chief, James Orr about the donation for some time.
"I'll be the registered donor," the son says. "But then dad will send the money to me, and then as soon as that's done and all those conversations are had the money is available."
"Thank you," Farage is heard saying.
Electoral law sets out that to be a permissible donor to a UK political party you must be a UK registered voter, or a company registered in the UK. In this instance, the son would be a permissible donor, his father would not be.
Here's a clip from the report:
Watch: Undercover reporters posing as party donors meet with Nigel Farage