Both Congress chambers met for just a few minutes on Thursday but took no steps to end the closure. The House and Senate will now meet again on Monday.

Many lawmakers did not return to Washington for the sessions.

Whether or not to fund the wall is the issue holding up the passing of a government funding budget.

Both sides now seem to accept that the dispute will continue into 2019.

The funding dispute has left hundreds of thousands of federal employees either on unpaid leave or not knowing when they will get paid.

What's the row about?

Mr Trump says he will not compromise on his demands for funding to build a border wall between the US and Mexico to tackle illegal immigration.

He is refusing to sign a wider spending package, forcing large parts of the government to shut down.

But opposition Democrats - who take over the House of Representatives in January - and some within Mr Trump's party, the Republicans, insist they won't give the president the $5bn he says he needs.

The president's opponents accuse him of exaggerating the issue of immigration for political gain, and argue that there are better forms of border security than a wall.

The situation has added to concerns over the outlook for the US economy in 2019, leading the stock market on a rollercoaster ride in recent days.

Why can't Trump get his budget passed?

His Republican Party controls both chambers of the outgoing Congress and the budget was indeed passed by the House on Thursday by 217 votes to 185.

However, he needs to find 60 votes in the 100-seat Senate, where the Republicans currently have 51, so he needs to enlist the support of Democrats there.

How is the shutdown playing out?

Nine of 15 federal departments, including State, Homeland Security, Transportation, Agriculture and Justice began partially shutting down after funding for them lapsed at midnight (05:00 GMT) last Saturday.

Hundreds of thousands of federal employees will have to work unpaid or are furloughed, a kind of temporary leave.

In practice, this means that:

• Customs and border staff will keep working, although their pay will be delayed. Airports will continue operating.
• About 80% of National Parks employees will be sent home, and parks could close - although some may stay open with limited staff and facilities.
• About 90% of housing department workers will take unpaid leave, which could delay loan processing and approvals.
• Most of the Internal Revenue Service (IRS) will be sent on unpaid leave, including those who assist taxpayers with queries.
• The Food and Drug Administration will pause routine inspections but "continue vital activities".

The remaining 75% of the federal government is fully funded until September 2019 - so the defence, veterans affairs, labour and education departments are not affected.