Donald Trump has marked his 100th day in office by claiming historic action on his agenda, renewing promises on healthcare and taxes, while attacking the media for allegedly misleading Americans.

To supporters at an evening rally in Pennsylvania, he promoted American power and patriotism while emphasising such priorities as American manufacturing, better trade deals for the US and a still-to-be defined tax cut plan.

Mr Trump's 100th day events were set in a politically important state that he won with 48 per cent of the vote. It was the first time Pennsylvania had voted for a Republican presidential candidate since George HW Bush in 1988.

The President visited the AMES Companies in Pennsylvania's Cumberland County, a shovel manufacturer since 1774.

With that backdrop he signed an executive order directing the Commerce Department and the US trade representative to conduct a study of trade agreements. The goal is to determine whether America is being treated fairly by its trading partners and the 164-nation World Trade Organisation.

Mr Trump's rally on Saturday night in Harrisburg offered a familiar recapitulation of what he and aides have argued for days are administration successes, including the nomination of Neil Gorsuch to the Supreme Court, his cabinet choices and the approval of construction of the Keystone XL pipeline.

Trump says NRA has a 'true friend in the White House'

But the President began the rally on a sour note, pointing out that he was not attending that night's White House Correspondents' Association dinner and issuing a scathing attack on the media. To cheers, he accused broadcasters and newspapers of running “fake news” and said if their job was to be honest and tell the truth, then they deserved “a big, fat failing grade.”

“I could not possibly be more thrilled than to be more than 100 miles way from Washington's swamp, spending my evening with all of you and with a much, much larger crowd and much better people, right?” he said.

Meanwhile, North Korea's missile launch signalled its continued defiance against the US, China and other nations, on which Mr Trump tweeted: “Bad!”

Asked during an interview for CBS' “Face the Nation” if military action would follow a nuclear test by the North, he responded: “I don't know. I mean, we'll see.”

At the 100-day mark, polls show that Mr Trump's supporters during the campaign remain largely in his corner. Though the White House created a website touting its accomplishments of the first 100 days, Mr Trump has tried to downplay the importance of the marker, perhaps out of recognition that many of his campaign promises have gone unfulfilled.

Donald Trump's first 100 days: in cartoons Show all 33 1 /33 Donald Trump's first 100 days: in cartoons Donald Trump's first 100 days: in cartoons Donald Trump's first 100 days in office were marred by a string of scandals, many of which caught the eye of the Independent's cartoonists Donald Trump's first 100 days: in cartoons Trump's first 100 days have seen him aggressively ramp up tensions with his nuclear rivals in North Korea Donald Trump's first 100 days: in cartoons Mr Trump has warned of a "major, major conflict" with the pariah nation lead by Kim Jong Un Donald Trump's first 100 days: in cartoons Mr Trump dropped the "mother of all bombs" on alleged ISIS-linked militants in Afghanistan, amid an escalation of US military intervention around the globe Donald Trump's first 100 days: in cartoons Mr Trump has been accused of falling short of the standards set by his predecessors in the Oval Office, including Franklin D Roosevelt Donald Trump's first 100 days: in cartoons The tycoon's ascension to the White House came at a time when the balance of power is shifting away from Western nations like those in the G7 group Donald Trump's first 100 days: in cartoons Western politicians, including the British Conservative party, have been accused of falling in line behind Mr Trump's proposals Donald Trump's first 100 days: in cartoons Brexit is seen to have weakened Britain, reducing still further any political will to resist American leadership Donald Trump's first 100 days: in cartoons Mr Trump's leadership has been marked by sudden and unexpected shifts in global policy Donald Trump's first 100 days: in cartoons Trump's controversial missile strike on Syria, which killed several citizens, was seen by some analysts as an attempt to distract from his policy elsewhere Donald Trump's first 100 days: in cartoons The President has also spent a large majority of his weekends golfing, rather than attending to matters of state Donald Trump's first 100 days: in cartoons Though free of gaffes, a visit from Chinese president Xi Jinping spotlighted trade tensions between the two states Donald Trump's first 100 days: in cartoons One major and unexpected setback came when Mr Trump's Healthcare Bill was struck down by members of his own party Donald Trump's first 100 days: in cartoons Mr Trump has been a figure of fun in the media, with his approval at record lows Donald Trump's first 100 days: in cartoons A string of revelations about Mr Trump's financial indiscretions did not mar his surge to the White House Donald Trump's first 100 days: in cartoons Outgoing President Barack Obama was accused of wiretapping Trump Tower by his successor in America's highest office Donald Trump's first 100 days: in cartoons The alleged involvement of Russian intelligence operatives in securing Mr Trump the presidency prompted harsh criticism Donald Trump's first 100 days: in cartoons The explosive resignation of Security Adviser Michael Flynn, who lied about his links to the Russian ambassador, was just one scandal to hit the President Donald Trump's first 100 days: in cartoons Many scandals, such as the accusation Barack Obama was implicated in phone-hacking, first broke on Mr Trump's Twitter feed Donald Trump's first 100 days: in cartoons Donald Trump's election provoked mass protests in the UK, with millions signing a petition to ban him from the country Donald Trump's first 100 days: in cartoons Donald Trump cited a non-existent terror attack in Sweden during a campaign rally Donald Trump's first 100 days: in cartoons Donald Trump stands accused of stoking regional tensions in Eastern Asia Donald Trump's first 100 days: in cartoons North Korea has launched a number of failed nuclear tests since Mr Trump took power Donald Trump's first 100 days: in cartoons Theresa May formally rejected the petition calling for Mr Trump to be banned from the UK Donald Trump's first 100 days: in cartoons When Mr Trump's initial so-called Muslim ban was struck down by a federal justice, the President mocked the 69-year-old as a "ridiculous", "so-called judge" Donald Trump's first 100 days: in cartoons A week after his inauguration, Theresa May met with Mr Trump at the White House Donald Trump's first 100 days: in cartoons Donald Trump's first days in office were marked by a hasty attempt to follow through on many of his campaign promises, including the so-called Muslim ban Donald Trump's first 100 days: in cartoons Donald Trump's decision to ban citizens of many majority-Muslim countries from the US sparked mass protests Donald Trump's first 100 days: in cartoons Revelations about Donald Trump's sexual improprieties were not enough to keep him from being elected President Donald Trump's first 100 days: in cartoons British PM Theresa May was criticised by many in the press for cosying up to the new President Donald Trump's first 100 days: in cartoons One of Mr Trump's top aides, Kelly Anne Conway, was mocked for describing mistruths as "alternative facts" Donald Trump's first 100 days: in cartoons British PM Theresa May was quick to demonstrate that her political aims did not hugely differ from Mr Trump's Donald Trump's first 100 days: in cartoons Donald Trump's inauguration, on 20 January 2017, sparked protests both at home and abroad

“It's a false standard, 100 days,” he said while signing an executive order on Friday. "But I have to tell you, I don't think anybody has done what we've been able to do in 100 days, so we're very happy.”

A failed effort to overhaul President Barack Obama's health care law behind him, Mr Trump is turning to what he's billed as the nation's biggest tax cut. It apparently falls short of Reagan's in 1981, and tax experts are sceptical that the plan would pay for itself, as Treasury Secretary Steve Mnuchin has claimed.

The economy, so far, has been Trump's ally. Polls show that Americans feel slightly better about his job performance on that subject than his job performance overall.

“Together we are seeing that great achievements are possible when we put American people first,” Mr Trump said in his weekly radio and internet address. “That is why I withdrew the United States from the Trans-Pacific Partnership. That day was a turning point for our nation. It put the countries of this world on notice that the sellout of the American worker was over.”

He said in his remarks: “In just 14 weeks, my administration has brought profound change to Washington.”

Executive orders in line to be signed Saturday would be the 31st and 32nd since Mr Trump took office - the most of any President in his first 100 days since World War II. During the campaign, Mr Trump railed against his predecessor's use of orders, which do not need congressional approval.