NOW that Donald Trump has officially become US President, the world will be watching as he moves on his top priorities.

While he has previously indicated an exhausting list of what he will do on his first day in office, he changed this to 18 actions he would undertake in the first 100 days, before offering a shortened list released as a YouTube clip after he was elected.

Some congressional Republicans had expected Trump to sign orders over the weekend, but those never materialised.

He did however, sign an executive order on Obamacare on Friday and the White House has also released statements on trade agreements.

Reince Priebus, White House chief of staff, has said Trump’s first full week in office would include action on trade, immigration and national security.

During an appearance on Fox News Sunday, Priebus also said that Trump was feeling the “enormity” of the presidency when he stepped into the Oval Office for the first time.

But Priebus said that Trump was “still the same person” and was “remarkably consistent.” Priebus said: “I can promise you he wants to make people proud.”

Trump is due to begin formally discussing his agenda Monday at a meeting with a bipartisan group of congressional leaders at the White House Monday night.

Here are six of Trump’s top priorities.

1. TRADE PARTNERSHIPS

Not long after Trump’s inauguration, the White House issued a statement that the US would not participate in the Trans-Pacific Partnership.

Australia is one of the signatories of the controversial TPP and despite the statement, Prime Minister Malcolm Turnbull on Monday was still spruiking its benefits saying the country needed trade to drive jobs. But Labor is arguing that it’s a waste of time to push ahead with ratifying the agreement without the US being on board.

Trade agreements are expected to be on the agenda when Britain’s Prime Minister Teresa May visits Trump on Friday.

May told the BBC that the Trump team was interested in discussing a new trade arrangement with Britain despite the “America first” theme of Trump’s inaugural address and his pledge to evaluate every trade deal for its possible benefits to the United States.

The White House website was updated immediately after Trump’s swearing-in to reflect his campaign commitment to renegotiate the North American Free Trade Agreement, that has linked Canada, the US and Mexico since 1994.

“We’re meeting with the prime minister of Canada and we will be meeting with the president of Mexico, who I know, and we’re going to start some negotiations having to do with NAFTA,” Trump said while addressing White House staff on his second full day in office.

Trump was also keen to label China a currency manipulator as part of his first day activities but has since pulled back on this, telling The Wall Street Journal he wanted to talk to them first.

2. OBAMACARE

Trump’s first executive order targeted the sweeping “Obamacare” law, which he signed hours after being sworn in as the 45th president of the United States.

The one-page directive gives agencies authority to grant waivers, exemptions and delays of provisions in the Affordable Care Act that would impose costs on state or individuals.

This appears to be aimed at undoing the requirement that individuals carry health insurance or face fines. But until it becomes clear what steps federal agencies take as a result, its full impact on Americans and their health insurance is uncertain.

The order also states that the federal government must allow states greater flexibility in carrying out health care programs.

The executive order may not have much impact for 2017, since government rules for this year have already been incorporated into contracts signed with insurance companies.

Trump needs the support of Congress to get rid of the health care law for good.

With Republicans in control of both the White House and Congress, undoing Obama’s signature health reform is at the top of the party’s agenda for 2017.

But Trump has been vague about what he wants included in a replacement package, saying his administration will have a plan after the Senate confirms his nominee to lead the Department of Health and Human Services, Rep. Tom Price.

The president has said he wants to keep some of the measure’s more popular elements, including allowing young people to stay on their parents’ insurance until age 26 and preventing insurance companies from denying coverage to people with pre-exiting conditions.

3. BUILD A WALL

Trump has famously promised to build a wall on America’s southern border with Mexico to keep illegal immigrants out of the US, and to get the Mexicans to pay for it.

“Mexico will be reimbursing the US for the full cost of such wall,” Trump has said in his 18 point plan for his first 100 days in office.

Trump also wants to establish a two-year mandatory minimum federal prison sentence for illegally re-entering the US and to enhance penalties for overstaying.

Trump is also expected to direct the government to deport the two million illegal immigrants who have criminal records.

He has said he would cancel visas to foreign countries that won’t take them back.

Trump will receive his Mexican counterpart Enrique Pena Nieto on January 31 and Reuters is reporting that Trump is expected to sign executive actions to begin constructing the wall.

4. NATIONAL SECURITY

Trump chose to address security officials at the CIA as a top priority on Sunday and emphasised his dedication to getting rid of Islamic State.

He said IS needed to be eradicated off the face of the Earth.

“This is evil ... it’s time right not to end it.”

So far what Trump plans to do to achieve this remains unclear.

Other measures Trump plans to introduce include expanding military investment and establishing new screening procedures for immigration so that people allowed into the US support the country’s values.

Trump has said he would suspend immigration from terror-prone regions where vetting cannot safely occur.

According to his revised Day 1 plan, Trump has said he would ask the Department of Defense and the Chairman of the Joint Chiefs of Staff to develop a plan to protect America from cyber-attacks, and all other form of attacks.

America’s support for NATO will also be discussed when British PM Teresa May visits on Friday after Trump rattled the US’s European allies by suggesting NATO is “obsolete”.

5. JOBS AND INFRASTRUCTURE

Trump wants to create at least 25 million new jobs through tax reduction and simplications.

This includes creating a rule that for every new regulation, two old regulations must be eliminated. He also wants to get rid of restrictions on the production of shale energy and clean coal to help stimulate job creation. He wants to lift restrictions on the Keystone Pipeline.

Trump hopes to grow the economy by 4 per cent per year.

Trump has promised to introduce tariffs that would discourage companies from relocating to other countries, costing Americans their jobs, just so they can ship their products back to the US tax-free.

He also wants to encourage $1 trillion in infrastructure investment over 10 years using public-private partnerships and encouraging private investment through tax incentives.

6. DRAIN THE SWAMP

Trump has said he would impose a five-year ban on executive officials becoming lobbyists after they leave the Administration — and a lifetime ban on executive officials lobbying on behalf of a foreign government.

He has said he wants to ban foreign lobbyists raising money for American elections and introduce a hiring freeze on all federal employees.