On a threshold that Trump has both derided and tried to define, the president also said he is putting Americans first even as he learns on the job.
"My only allegiance is to you, our wonderful citizens," Trump said in his weekly radio address.
It was a preview of a day on which Trump was travelling to Pennsylvania to emphasise such priorities as American manufacturing, better trade deals for the US and his underdog victory over Democrat Hillary Clinton in November. He also was promoting a still-to-be defined tax cut plan and the nation's strong economy, on which many of his political fortunes rest.
Trump's 100th day events are set in politically important Pennsylvania, which he won with 48 per cent. It was the first time the state had voted for a Republican presidential candidate since George HW Bush in 1988.
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Trump planned to sign an executive order directing the Commerce Department and the US trade representative to conduct a study of US trade agreements. The goal is to determine whether America is being treated fairly by its trading partners and the 164-nation World Trade Organisation.
Trump's 100-day rally was a bit of counter-programming from the former reality television star. Back in Washington, media organisations and a few stars were gathering today for the annual White House Correspondents Association Dinner. Trump, who has derided journalists as "dishonest" and even enemies of the American people, is the first president since 1981 to stay away from the event. That year, Ronald Reagan was recovering from an assassination attempt.
"It's a false standard, 100 days," Trump said while signing an executive order yesterday, "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 healthcare law behind him, 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 skeptical 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.
He said in his remarks: "In just 14 weeks, my administration has brought profound change to Washington."
Executive orders in line to be signed today would be the 31st and 32nd since Trump took office -- the most of any president in his first 100 days since World War II. During the campaign, Trump railed against Obama's use of orders, which don't need congressional approval.