British Prime Minister Boris Johnson has warned of “lasting and catastrophic damage” to Britain’s political parties if the result of the Brexit referendum is not honored.

He told Sky News Friday that people protesting his decision to suspend Parliament during part of the run-up to the Oct. 31 Brexit deadline must realize that “the worst thing for democracy” would be to fail to make Brexit a reality.

He also says the protests and legal challenges to his policy are making it harder for Britain to forge a new deal with European Union leaders because they may believe Parliament can stop Brexit.

A court hearing in Scotland on a legal challenge seeking to block the British government’s plan to suspend Parliament has been moved up and will be heard on Tuesday.

The Court of Session hearing in Edinburgh had originally been set for Sept. 6.

Judge Raymond Doherty on Friday refused to grant a request to immediately halt Prime Minister Boris Johnson’s plan to suspend Parliament for several weeks but agreed that a “substantive” hearing would be held.

The government’s plan would shorten the time political opponents in Parliament would have in their bid to prevent Britain from leaving the European Union without a deal on Oct. 31 if no agreement with the EU is reached by then.