Donald Trump unveiled a new section of the US-Mexican border wall - but it was overshadowed by the Trump baby blimp made famous during UK protests against him.

The orange parody of the US president in a nappy made an appearance yesterday, hours before the real thing arrived to rant about 'a colossal surge' of migrants coming to America.

The blimp, or one that looks exactly like it, made headlines around the world last year when it was paraded through the streets of London to oppose Trump's UK visit.

The President yesterday promised approximately 450 miles of new "wall" along the southern US border, after threatening to slap Mexico with an unspecified economic penalty to crack down on what he describes as a 'crisis' of undocumented immigration and drug trafficking.
Protesters oppose the extra spending on the wall Trump is trying to force through (
Image:
REUTERS)

Before touring a just completed 30-foot tall, 2.2 mile barrier at Calexico, Trump said more US military resources will be dispatched to the border.

"Our country is full," Trump said in a warning to migrants wanting to move from the south. "Can't take you anymore."

Border officials have said they need 722 miles of new or replacement barriers.
According to reports Trump and the baby were not on site at the same time (
Image:
REUTERS)

Praising Mexico for moving recently against drug traffickers, Trump said, "If they continue that, everything will be fine. If they don't we're going to tariff their cars at 25 percent."

"Also, I'm looking at an economic penalty for all of the drugs that are coming in through the southern border and killing our people," Trump told reporters in Washington.
President Trump tours the border wall between the United States and Mexico in Calexico, California (
Image:
AFP/Getty Images)

Meanwhile, 20 states have filed a motion to block Trump's attempts to divert federal funds through an emergency declaration, New York Attorney General Letitia James, a Democrat, said on Friday.

Trump is counting on seizing funds from other federal accounts and shifting them for the construction, a move being challenged in federal court because Congress has not given approval.
Journalists lining up in front of the wall (
Image:
REUTERS)

Democrats generally oppose Trump's wall proposal, suggesting instead other types of enhanced border security that they argue would be more effective and less costly.

The US House of Representatives on Friday also filed a lawsuit challenging Trump's ability to seize
the funds, House Speaker Nancy Pelosi said.