WASHINGTON, Feb 19 - U.S. President Donald Trump will preside over the first meeting of his Board of Peace on Thursday with unresolved questions on the future of Gaza hanging over an event expected to include representatives from more than 45 nations.

The disarmament of Hamas militants and accompanying withdrawal of Israeli troops, the size of the reconstruction fund and the flow of humanitarian aid to the war-battered populace of Gaza are among the major questions likely to test the effectiveness of the board in the weeks and months ahead.