He may have done just a little over a year at the White House, but President Donald Trump is already setting his sights on a new campaign line for his 2020 re-election bid. It will be “Keep America Great!”, the billionaire president told a raucous rally of supporters in Pennsylvania on Saturday night, suggesting that he has already lived up to his winning 2016 slogan: “Make America Great Again”.

“We can’t say ‘Make American Great Again’ because I already did that,” Trump said in Moon Township, a Pittsburgh suburb, adding: “Our new slogan when we start running in -- can you believe it, two years from now? -- is going to be ‘Keep American Great, exclamation point.”

It turns out that Trump actually had hit upon the “Keep America Great” slogan long ago, having told The Washington Post in January 2017 that he had instructed his lawyer to trademark the phrase with and without an exclamation point.

“The task for all of us, for everyone here tonight is to make sure that this great American comeback continues full speed ahead. We are doing things that are amazing,” Trump said as he campaigned for a Republican locked in a stiff contest with a Democrat in a special Congressional election on Tuesday. “The world is watching. Get out on Tuesday and vote like crazy,” he told the crowd.

Trump made it a point to tout his controversial decision to slap 25 per cent on imported steel – something that was set to resonate in Pittsburgh – once the centre of America’s steel industry and still carries the title “The Steel City”, despite plants having closed down in recent decades in the face of acute competition from cheaper foreign steel.

“Steel is back. Aluminium is back,” he claimed, predicting that a lot of steel mills would now reopen because of his tariffs push to keep cheaper imports at bay.

Ditching his prepared address, Trump attacked his three predecessors – Barack Obama, George W. Bush and Bill Clinton – for their failure to resolve the North Korean nuclear issue. “They all had their shot and all they did was nothing,” he said and claimed that it was because of his own maximum pressure campaign that Kim Jong Un has now sought a meeting with him and he has accepted the invitation.

Back to his familiar campaign mode, Trump also lashed out yet again at the liberal mainstream media and a host of Democrats, notably House Democratic Leader Nancy Pelosi, Congresswoman Maxine Walters and Senator Elizabeth Warren, who is thought to be among a host of Democrats considering a presidential run in 2020.

“I look forward, I really do, I look forward to 2020 because I want to see how far left the person is going to be that we’re going to run against,” Trump said. Bringing up Oprah Winfrey, he urged the media celebrity to throw her hat into the ring, saying he would “love” to campaign against her. “I would love to beat Oprah. I know her weakness. I know her weakness … I would love it. That would be a painful experience for her,” he remarked.