RIYADH, May 21 (Reuters) - U.S. President Donald Trump said in Riyadh on Sunday he intends to discuss the fight against Islamic State at a news conference he intends to hold in about two weeks time.

Trump, on a two-day visit to Riyadh, is trying to rally support from Arab and Muslim leaders against the militant group which is still in control of swathes of land in Syria and Iraq despite an offensive by government troops in Iraq and U.S.-allied forces in Syria.

(Reporting by Steve Holland, writing by Sami Aboudi; Editing by Elaine Hardcastle) ((Sami.Aboudi@thomsonreuters.com; +97143918301;))