WASHINGTON (BLOOMBERG) - The White House will decide "day-to-day" on whether President Donald Trump, members of his Cabinet and other administration officials will attend the World Economic Forum in Davos, Switzerland, this week.

Mick Mulvaney, director of the Office of Management and Budget, said at a press briefing on Saturday that a final decision hasn't been made on whether Trump will travel as planned, given the federal government shutdown that began overnight.

The president is expected to arrive at Davos on Jan 25 and make a speech to the forum on Jan 26.

On Friday, a White House official declined to say whether Trump would attend Davos - an annual gathering of the world's financial and political elite, at which the president was expected to hammer home his "America First" message - if the government was shut.

Trump is scheduled to meet in Switzerland with leaders including British Prime Minister Theresa May.

A large White House contingent is expected to go as well, from Secretary of State Rex Tillerson and Treasury Secretary Steven Mnuchin, to the secretaries of labour, transportation and energy and Trump's son-in-law Jared Kushner.