"I am respectfully cancelling my very important trip to Davos, Switzerland for the World Economic Forum," he said in a tweet.

 

Trump blamed opposition Democrats' "intransigence" over his demand for $5.7 billion to extend a border wall with Mexico. As a side-effect of the row, swaths of the U.S. government are temporarily closed, leaving more than 800,000 employees without pay.

 

Trump had been due to make a brief appearance at the annual Davos get-together, which runs between January 21-25.