The filing asks a federal judge to declare the authorization for the event, framed around the country’s 250th anniversary, unlawful. Legal challenge claims US president did not seek proper approval for fighting event to be held on his 80th birthday. Key points and original sources are listed below.

• The filing asks a federal judge to declare the authorization for the event, framed around the country’s 250th anniversary, unlawful.S1

• Legal challenge claims US president did not seek proper approval for fighting event to be held on his 80th birthday. A lawsuit is seeking to stop United States President Donald Trump from hosting an Ultimate Fighting Championship (UFC) match at the White House...S2

• A federal lawsuit said the event, set for June 14, was unlawfully planned and designed to benefit Mr. Trump and his allies.S3