Donald Trump has fired his campaign manager Corey Lewandowski.
Mr Trump's spokeswoman Hope Hicks confirmed Mr Lewandowski's departure, adding that the campaign is grateful for his "hard work and dedication".
A source close to Mr Trump said Mr Lewandowski was forced out largely because of his poor relationship with the Republican National Committee and party officials.
Mr Lewandowski had been by Mr Trump's side since the beginning of his campaign, and travelled with him on his private plane to almost every campaign stop.
Mr Lewandowski, a controversial figure himself within the Trump campaign, frequently dismissed the idea that Mr Trump needed to hire more experienced political hands or temper his rhetoric.
Mr Lewandowski's departure comes as Mr Trump faced continued resistance from elements within the Republican Party concerned about his controversial statements.