Trump is demanding $5.7bn, which was passed by the House of Representatives, but is expected to be rejected in the Senate.

"I hope we don't but we are totally prepared for a very long shutdown," he said during a White House event.

If no deal is reached, parts of the US government will begin to close at midnight on Friday.

With only hours remaining to strike a deal, Mr Trump said that the "chances are probably very good" of a "Democrat shutdown".

The Republican president met senators from his own party beforehand at the White House, where they held a "great meeting" that "lasted a long time," he added.

"Shutdown today if Democrats do not vote for Border Security!" he tweeted earlier on Friday.

What next?

The Senate is currently voting on a measure that the House approved a day earlier by 217-185.

The window for senators to vote will remain open for much of the day on Friday, as senators return to Washington from around the country.

Mr Trump will postpone his Christmas trip to Florida in the event of a shutdown, aides say.

Any partial shutdown would be the third such closure of federal agencies in 2018.

If it occurs, it may not be settled until after the New Year, when Democrats take control of the House.

BBC News