MEP and Brexit Party leader Nigel Farage | Tolga Akmen/AFP via Getty Images Farage rejects European Parliament summons over undisclosed gifts Brexit Party leader says he won’t appear before ‘EU kangaroo court.’

Nigel Farage rejected a European Parliament committee request to appear in Brussels within 24 hours to testify about allegations that he failed to disclose gifts worth £450,000 from a British businessman.

Farage, an MEP and leader of the Brexit Party, said he received a letter at 2:45 p.m. Tuesday from the Parliament's advisory committee on the conduct of MEPs, requesting that he testify in Brussels within a day's time.

“What is this but an EU kangaroo court where I am given 24 hours' notice about allegations picked up from press stories," Farage said in a statement, denying any wrongdoing.

"I did not receive any private money for political purposes," Farage said.

Last month, the Parliament opened an investigation into Farage after the U.K.'s Channel 4 News reported that the British politician had failed to declare gifts worth £450,000 from insurance tycoon Arron Banks, a co-founder of the Brexit campaign group Leave.EU. OLAF, the EU's anti-fraud agency, is also in the process of determining whether to open a formal investigation into the allegations.

Under Parliament rules, members have to declare gifts they have received "when representing Parliament in an official capacity," and "such gifts are reported in the register of gifts." Banks' support for Farage reportedly included a car with a driver, trips to the United States and a lavish home in London's upscale Chelsea neighborhood.

A Parliament spokesperson declined to comment on the allegations against Farage, saying the advisory committee's decisions are not made public.

The committee can make recommendations to the Parliament president regarding whether an MEP has violated the code of conduct.

Farage's Brexit Party was the clear winner of the European election in the U.K. and is set to fill 29 seats in the next Parliament.

Farage is also in the midst of negotiating a potential leadership position in one of the Euroskeptic groups in Parliament.

"If they try to bar me from the building, who else gives voice to the thousands of people who voted for me? Is this democracy EU style?" Farage said in the statement.