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Millions around the world are anxiously watching to find out what Donald Trump will do on his first days as US president.

The business mogul made a number of grandiose promises on the campaign trail - from building a wall along the US-Mexico border to repealing Obamacare.

He's expected to begin his presidency with executive orders on everything from illegal immigration to energy production in a bid to undo Barack Obama's legacy.

With so many promises it'll be a wonder if he manages to get them all done on Day One.

And the 70-year-old has already said he won't get down to business straight away.

He's indicated that he will sign some orders on Friday before taking the weekend off and returning to work on Monday.

(Image: AFP)

Here's a look at what Trump has pledged to do - or is expected to do - during his first days as president:

Repeal Obamacare

Trump has pledged to repeal "every single Obama executive order" as soon as he takes over the White House.

That would include the Affordable Care Act, known as Obamacare.

But opponents argue that such an immediate move would cause chaos because the Republicans wouldn't have new legislation to replace the act.

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Deport illegal immigrants

Trump is expected to order the government to deport around two million convicted criminals who are allegedly in the country illegally.

Some observers think this directive could be handed down immediately.

He has promised to pull federal funding for so-called "sanctuary cities" where local authorities don't detain immigrants who are in the country illegally.

(Image: Getty)

Build a wall on the US-Mexico border

Trump famously promised that he would build a wall along the border if elected, but the order may not be given immediately.

Such a wall would cost billions, but Trump vowed that he would force Mexicans to reimburse the US government for all costs.

Republicans are reportedly developing plans to fund the wall using money from US taxpayers.

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(Image: Getty)

Change the visa programme for foreign workers

Trump, the 45th president in US history and the first to have never served in the military or held public office, has faced plenty of criticism for his comments about immigrants.

He has signalled that one of his first moves will be to alter visa programmes.

Reports suggested that it could involve a revamp of a programme used to bring foreign workers to the US for high-skilled jobs.

Halt funding for family planning groups

Observers expect Trump to ban US funding to international family planning groups which provide abortions.

It's a situation that has changed every time the Oval Office has changed hands between parties.

The ban was implemented by Ronald Reagan, repealed by Bill Clinton, implemented again by George W Bush and then rescinded by Obama after he took office in 2009.

(Image: Getty)

Cancel payments to UN climate change programmes

After November's shock election victory Trump was said to be looking at ways to quickly withdraw the US from the global treaty on climate change.

In the past Trump has called global warming a hoax and promised to quit the agreement supported by Obama.

He has promised to cancel payments to UN climate change programmes.

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Suspend the Syrian refugee programme

Immigration was a key theme of Trump's unlikely election victory.

He was widely criticised during the campaign for proposing a temporary ban on Muslim visitors to the US.

It is expected he will suspend or scale back the Syrian refugee resettlement programme, and immigration from countries associated with terrorism.

(Image: Getty)

Withdraw from the Trans-Pacific Partnership

Trump made it very clear during the transition that he planned to withdraw from the TPP as soon as he became president.

In a video posted on YouTube he said he would issue a note of intent to pull out of the trade agreement.

Trump called it a "potential disaster" for the US and vowed to negotiate "fair bilateral trade deals" in a bid to create more jobs.

He has also promised to renegotiate or scrap the North American Free Trade Agreement.

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Cancel restrictions on energy production

Trump plans to cancel Obama's restrictions on energy, including shale and clean coal, which he claims have stifled job creation.

During the transition he claimed the move would create "many millions of high-paying jobs".

He's also promised to lift restrictions on the Keystone XL pipeline.

(Image: AFP / Getty)

Implement new lobbying rules

Trump's transition team has already announced they will require incoming members of the administration to terminate their lobbying registrations.

They must also agree not to lobby again for five years after leaving the administration.

Those who join the administration will be required to sign a pledge.

Trump also promised to introduce a constitutional amendment for congressional term limits.