Democrats ram through vote in the House against Trump's emergency order

An incomplete section of border fencing in El Paso, Texas. Photo / AP file

The US House of Representatives has voted to overturn President Donald Trump's emergency declaration with more than a dozen Republicans joining Democrats to try to block it.

Trump wants to divert funds to support a wall on the US-Mexico border without congressional approval.

Now the resolution will be discussed in the Senate where only a simple majority is required to pass.

There, Democrats are only one vote short of achieving the aim of both houses rebuking Trump. Three Republicans have so far said they support the resolution.

Democrats ignored a veto threat and rammed legislation through that would stymie Trump's bid for billions of extra dollars for his border wall, escalating a clash over whether he was abusing his powers to advance his paramount campaign pledge.

The House's 245-182 vote to block Trump's national emergency declaration throws the political hot potato to the Republican-run Senate, where there were already enough GOP defections to edge it to the cusp of passage.

Vice-President Mike Pence used a lunch with Republican senators at the Capitol to try keeping them aboard, citing a dangerous crisis at the border, but there were no signs he'd succeeded.

"I personally couldn't handicap the outcome at this point," said Senate Majority Leader Mitch McConnell, who's planning a vote within the next three weeks.

Senate passage would force Trump's first veto, which Congress would surely lack the votes to override.

But the showdown was forcing Republicans to cast uncomfortable votes pitting their support for a president wildly popular with GOP voters against fears that his expansive use of emergency powers would invite future Democratic presidents to do likewise for their own pet policies.

Underscoring their desire to avoid a tally suggesting that Trump's hold on lawmakers was weakening, House Republican leaders worked to keep the number of GOP supporters below 53. That's how many would be needed to reach a two-thirds majority of 288 votes, assuming all Democrats vote "yes," the margin required for a veto override.

Thirteen House Republicans joined all voting Democrats today to support the Democratic resolution.

- AP