President Trump said he will skip a global economic forum in Switzerland later this month to remain in Washington while the government is partly shut down over funding for a wall on the southern border.

“Because of the Democrats intransigence on Border Security and the great importance of Safety for our Nation, I am respectfully cancelling my very important trip to Davos, Switzerland for the World Economic Forum,” Trump posted on Twitter as he was flying aboard Air Force One to Texas, where he was going to visit the border. “My warmest regards and apologies to the @WEF!”

Trump and Congress are deadlocked over funding for his wall, resulting in a partial government shutdown that has left 800,000 federal workers either on furlough or working without pay.

The shutdown entered its 20th day Thursday.

Trump also remained in the White House over the Christmas holiday because of the shutdown — except for a one-day trip to visit with US troops in Germany and Iraq.

The forum will be held Jan. 22.