Later in the night, Haley and Scott did offer a softer tone as they highlighted their experience growing up as people of colour.
"I was a brown girl in a black and white world," Haley said, noting that she faced discrimination but rejecting the idea that "America is a racist country."
She also gave a nod to the Black Lives Matter movement, saying "of course we know that every single black life is valuable."
And Scott, the Republican Party's only black senator, levelled the kind of personal attack against Biden that Trump and his white allies could not.
"Joe Biden said if a back man didn't vote for him, he wasn't truly black. Joe Biden said black people are a monolithic community," Scott charged.
He acknowledged that African Americans have sometimes been victimised by police brutality, but later said: "The truth is, our nation's arc always bends back toward fairness. We are not fully where we want to be ... but thank God we are not where we used to be."
The GOP convention marks a crucial moment for Trump, a first-term Republican president tasked with reshaping a campaign he is losing by all accounts, at least for now.
A deep sense of pessimism has settled over the electorate 10 weeks before election day.
Just 23 per cent of Americans think the country is heading in the right direction, according to a new poll from AP-NORC Centre for Public Affairs Research.
Trump, who was not scheduled to deliver his keynote convention address until later in the week, made multiple public appearances throughout the first day of the four-day convention. And while the evening programming was carefully scripted, Trump was not.
"The only way they can take this election away from us is if this is a rigged election," Trump told hundreds of Republican delegates gathered in North Carolina, raising anew his unsupported concerns about Americans' expected reliance on mail voting during the pandemic. Experts say mail voting has proven remarkably secure.
Trump and a parade of fellow Republicans distorted Trump rival Joe Biden's agenda, falsely accusing the Democrat of proposing to defund police, ban oil fracking, take over health care, open borders and raise taxes on most Americans.
They tried to assign positions of the Democratic left to a middle-of-the-road candidate who explicitly rejected many of the party's most liberal positions through the primaries.
Trump set the tone with unsupported claims about voting fraud and falsehoods about his own record in office.
The Republican convention comes as more than 177,000 Americans have been killed by the pandemic and millions more have been infected. Coronavirus-related job losses also reach into the millions
Trump and his supporters touted his response to the pandemic while standing alongside front-line workers in the White House, although he glossed over the mounting death toll, the most in the world, and his Administration's struggle to control the disease.
Organisers also repeatedly sought to cast Trump as an empathetic figure, borrowing a page from the Democrats' convention playbook a week ago that effectively highlighted Biden's personal connection to voters.
The programme highlighted the tension within Trump's Republican Party.
His harsh attacks against Democrats who are trying to expand mail voting and demonstrators protesting deaths in police custody, for example, often delight his die-hard loyalists. Yet the party pointed to a somewhat more diverse convention lineup with a more inclusive message designed to expand Trump's political coalition beyond his white, working-class base.
Several speakers in the prime-time programme were people of colour. And one of several African Americans on the schedule, former football star Herschel Walker, defended the president against those who call him a racist.
"It hurts my soul to hear the terrible names that people call Donald," Walker said. "The worst one is 'racist.' I take it as a personal insult that people would think I would have a 37-year friendship with a racist."
Polling shows that Black Americans continue to be overwhelmingly negative in their assessments of the President's performance, with his approval hovering around 1 in 10 over the course of his presidency, according to Gallup polling.
The programme also featured Mark and Patricia McCloskey, the St Louis couple arrested after pointing guns at Black Lives Matter protesters marching past their home.
"Democrats no longer view the government's job as protecting honest citizens from criminals, but rather protecting criminals from honest citizens," the McCloskeys said in remarks that broke from the optimistic vision for America organisers promised.
They added: "Make no mistake: No matter where you live, your family will not be safe in the radical Democrats' America."
Those cheering Trump's leadership on the pandemic included a coronavirus patient, a small business owner from Montana and a nurse practitioner from Virginia.
"As a healthcare professional, I can tell you without hesitation, Donald Trump's quick action and leadership saved thousands of lives during Covid-19," Amy Ford, a registered nurse who was deployed to New York and Texas to fight the coronavirus.
Some of the planned remarks for the evening program were prerecorded, while others were to be delivered live from a Washington auditorium.
The fact that the Republicans gathered at all stood in contrast to the Democrats, who held an all-virtual convention last week. The Democratic programming included a well-received roll call video montage featuring diverse officials from across the nation. The Republicans spoke from the ballroom in Charlotte and were overwhelmingly white.
Trump said he had made the trip to North Carolina to contrast himself with his Democratic rival, who never travelled to Wisconsin, the state where the Democratic convention was originally supposed to be held. Vice-President Mike Pence appeared with him.
The President has sought to minimise the toll of the coronavirus pandemic and he barely addressed it today, but its impact was plainly evident at the Charlotte Convention Centre, where just 336 delegates gathered instead of the thousands once expected to converge on this city for a week-long extravaganza. Attendees sat at well-spaced tables at first and masks were mandatory, though many were seen flouting the regulation.
Trump also panned the state's Democratic governor for restrictions put in place to try to prevent the spread of the virus, which has killed more than 175,000 people in the country and infected millions.
The president accused Governor Roy Cooper of "being in a total shutdown mode," and claimed the restrictions were aimed at trying to hurt his campaign.
Mecklenburg County Health Director Gibbie Harris said she had "shared concern about the lack of mask wearing and social distancing in the room" with RNC staff and had "been assured that they are working hard to address these issues."
Republicans will spend the week trying to convince the American people that the president deserves a second term.
Aides want the convention to recast the story of Trump's presidency and present the election as a choice between his vision for America's future and the one presented by Biden.
"Over the next four days, President Trump and Republicans are going to talk about all we have achieved the past four years, and cast an aspirational, forward-looking vision about what we can achieve in the next four," said GOP Chair Ronna McDaniel.
Democrats were content to let Trump's unfiltered message drive the day.
While he campaigned aggressively across the country throughout last week's Democratic convention, Biden made no public appearance.
- AP
