US President Joe Biden has formally announced that he is running for re-election in 2024, asking voters to give him more time to "finish the job" he began.
Mr Biden made his announcement in a video released by his new campaign team, in which he declares it is his job to defend American democracy.
It opens with imagery from the January 6, 2021, attack on the US Capitol by supporters of former president Donald Trump.
"When I ran for president four years ago, I said we're in a battle for the soul of America, and we still are," Mr Biden said.
"This is not a time to be complacent. That's why I'm running for re-election.
"Let's finish this job. I know we can."
Mr Biden described Republican platforms as threats to American freedom, vowing to fight efforts to limit women's healthcare, cut social security and ban books, while blasting "MAGA extremists".
MAGA is the acronym for the "Make America Great Again" political slogan of Mr Trump, who may well be Mr Biden's Republican opponent in the November 2024 election.
In the two years since he took over from Mr Trump, Mr Biden won Congress' approval for billions of dollars in federal funds to tackle the COVID-19 pandemic and for new infrastructure, and oversaw the lowest levels of unemployment since 1969, although a 40-year high in inflation has marred his economic record.
Mr Biden's age, at 80, makes his re-election bid a historic and risky gamble for the Democratic Party, which faces a tough election map to hold the Senate in 2024, and is the minority in the House of Representatives now.
His approval ratings were stuck at just 39 per cent in a Reuters/Ipsos poll released on April 19 and there are concerns about his age among some Americans.
Doctors declared Mr Biden, who does not drink alcohol and exercises five times a week, "fit for duty" after an examination in February.
The White House says his record shows that he is mentally sharp enough for the rigours of the job.
Mr Biden will be joined in his 2024 quest by his running mate, Vice-President Kamala Harris.
A potential Trump rematch
Mr Biden's entry into the race follows Mr Trump's announcement in November that he would seek a second term after losing the 2020 contest to Mr Biden.
Running as an incumbent, Mr Biden is unlikely to face much competition from inside his party.
No senior Democrats have shown signs of challenging him and he has compiled a board of rising-star Democrats to advise his campaign, including governors JB Pritzker of Illinois and Josh Shapiro of Pennsylvania.
Potential and declared Republican presidential candidates have begun framing the 2024 election around cutting back government spending amid still-high inflation, restricting abortion, crime in Democratic-run cities and illegal immigration.
The two leading Republican contenders, Mr Trump and Florida Governor Ron DeSantis, want to limit the access of trans children to sports teams and gender-affirming medical care, and restrict how schools teach LGBTQ+ issues and America's history of slavery and racial disparities.
The race will look different
Mr Biden ran a mostly virtual campaign to defeat Mr Trump in the 2020 election as COVID raged, saying he sought to unify the country, rebuild the economy, and better control the virus.
With pandemic restrictions mostly over in the United States, the 2024 race is likely to be a much different, more physical affair.
After losing by 7 million votes to Mr Biden in 2020, Mr Trump refused to concede defeat, falsely claiming that there had been widespread electoral fraud.
Mr Biden's campaign video suggests he plans to remind voters of the Capitol riots, while lauding his handling of the economic recovery from the pandemic slump, especially the strength of the labour market.
Reuters
