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Media captionPresident Trump and Democratic leaders clash over border wall funding in a feisty Oval Office meeting.

US President Donald Trump has threatened to shut down the government over funding a US southern border wall in budget talks with top Democrats.

In a heated exchange with Nancy Pelosi and Chuck Schumer, Mr Trump said he would be “proud” to shut down the government over border security.

Lawmakers face a partial shutdown if a deal is not reached by 21 December.

Mrs Pelosi and Mr Schumer argue that the $5bn (£4bn) Mr Trump demands is too high.

Mr Trump opened the Oval Office meeting calling it a “great honour” to have the Democrats present.

But meeting soon turned contentious as Mrs Pelosi and Mr Schumer argued that legislation to keep the government open could pass both houses of Congress before funding for some agencies was set to expire on 21 December.

The president contended that it could only pass if it met his demands for more funding for his proposed border wall at the US-Mexican border.

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The clock is ticking…

Analysis by Anthony Zurcher, BBC Washington

Donald Trump opened his press event with Democratic leaders Nancy Pelosi and Chuck Schumer with a feel-good embrace of bipartisanship.

It didn’t last long.

The two Democrats and the president sparred over funding for the Mr Trump’s proposed border wall. It seemed for a moment as though they might agree on funding for “border security” – but that linguistic pirouette disappeared beneath an onslaught of acrimony.

The president wants his wall funding. He campaigned on it. He promised it. And even though Mexico isn’t going to pay for it, he wants it now.

Democrats, on the other hand, are loath to give him this victory. What’s more, they’re intent on having the blame for any government shutdown directed solely at the president.

In the end Mr Trump gave the Democrats what they wanted. He said he would shut down the government if “we don’t get what we want”. He would be “proud” to do it.

Democrats will try to make the president regret those words. Mr Trump, on the other hand, thinks the public – or at least his base – is with him in this fight.

If neither side blinks, we’ll know who is right in a few weeks.

After the meeting, Democrat Chuck Schumer condemned Mr Trump’s “temper tantrum” in the White House Oval Office.

Nancy Pelosi, who is expected to become Speaker of the House when Democrats take over the chamber next month, mocked Mr Trump’s “Christmas present” to the American people as she spoke outside the White House.