Donald Trump has dubbed Joe Biden, the man hoping to succeed him in the White House, “the destroyer of American greatness”.
And with that convention speech, the president signalled that the US election is now in full swing.
For his part, Mr Biden has picked Kamala Harris to join him on the Democratic presidential ticket this November and he hopes the California senator offers the best chance of beating Mr Trump and Mike Pence on November 3.
Attention has turned to how the Democratic and Republican pairings match up.
Mr Biden and Ms Harris were formally nominated as the presidential and vice presidential candidates at the Democratic convention earlier this month, while Mr Trump and Mr Pence accepted their nominations at the Republican convention.
Read more: Vice-presidential debate 2020: Harris and Pence clash over coronavirus response
What happens next?
Convention speeches are one thing. But the real test of these two pairs is during the presidential debates, when the American public finally see the political opponents face each other on the debate stage.
Mr Trump and Mr Biden went at each other hammer and tongs in the first of three debates on September 29, but who won the first election debate?
In a bad-tempered and at times chaotic debate, the candidates ripped chunks out of each other on their records and issues such as the economy and race.
Mr Trump was rebuked several times by Chris Wallace, the moderator, for speaking over his opponent. At one point, after incessant interruptions from the president, Mr Biden said: “Will you shut up, man?”
On the weekend of October 3-4, the Trump campaign announced something of a relaunch of their campaign after the turmoil of the president’s illness, using the banner “Operation MAGA”, which stands for Mr Trump’s campaign slogan – Make America Great Again.
Mike Pence, the US vice president, went head-to-head in the vice-presidential debate that took place on the night of October 7 with Kamala Harris, the Democratic presidential nominee, in Utah.
There were two more presidential debates scheduled but when it was announced the October 15 debate would be held virtually because of Mr Trump’s coronavirus diagnosis the president refused to participate.
“I’m not going to do a virtual debate,” Mr Trump told Fox News, calling the decision “ridiculous” moments after the Commission on Presidential Debates announced the changes.
The final presidential debate is still scheduled to be held at Belmont University in Nashville, Tennessee, on October 22.
The debates are streamed by all major US networks, including ABC, CBS, NBC, Fox News, CNN and MSNBC.
So how do the candidates match up? We analyse the strengths and weaknesses of each politician.
Read more: Who won the vice-presidential debate?