FILE PHOTO: U.S. Secretary of Transportation Elaine Chao speaks ahead of Press Days of the North American International Auto Show at Cobo Center in Detroit, Michigan, U.S., January 14, 2018. REUTERS/Rebecca Cook

WASHINGTON (Reuters) - The Trump administration is weighing a range of options to fund public infrastructure projects, including private-sector investments and a higher tax on gasoline, U.S. Transportation Secretary Elaine Chao said on Tuesday.

Trump will donate his quarterly salary to the Transportation Department to help fund infrastructure projects, White House spokeswoman Sarah Sanders said at a daily White House news briefing.