The pro-independence Hong Kong National Party on Thursday said “additional information” the police have provided to support a proposal to shut it down was another example of the force's "ridiculous evidence".

In a statement, party leader Chan Ho-tin said the police have merely recounted what had happened at a widely-reported luncheon where he gave a speech, and detail an open letter the party sent to US President Donald Trump asking him to target Hong Kong in his trade war with China.

The party also made public what it said was its latest correspondence from the Security Bureau, dated the previous day.

It contained the entire speech Chan gave at the Foreign Correspondents’ Club on August 14 and the full transcript of a question-and-answer session that followed, and the open letter to Trump published a few days later.

The Security Bureau said the latest development showed that the party had “taken a positive step to heighten its profile in furthering its unlawful advocacy for Hong Kong independence”.

The party said on its Facebook page that the government's latest move shows that the ban proposal was made entirely out of what it called "political servitude".

The party has been given until September 11 to state its case to the bureau.