Portugal Colonial - Biden compares 'sick' Trump to Nazis in 2024 campaign launch

The 81-year-old Democrat branded his likely challenger in November a "loser" and "sick" in a speech on the eve of the third anniversary of the deadly January 6 Capitol attack by pro-Trump supporters.

"He's willing to sacrifice our democracy, put himself in power," Biden told supporters, alternating between whispers and furious shouts as he laid into the man he beat in 2020.

Not only had twice-impeached former president instigated the Capitol attack, but the tycoon and his followers were still embracing "political violence" ahead of the 2024 vote, said Biden.

"He calls those who oppose him vermin. He talks about the blood of Americans being poisoned, echoing the same exact language used in Nazi Germany," he added.

Biden chose a symbolic location for the speech near Valley Forge in Pennsylvania, the historic site where George Washington rallied American forces fighting their British colonial rulers nearly 250 years ago.

He portrayed himself as a defender of America's institutions, warning that if Trump won a second term in the White House then democracy itself was at risk.

"Trump's assault on democracy isn't just part of his past. It's what he's promising for the future," said Biden.

- 'Sick' -

Biden's full frontal attack on Trump came after criticism from some Democrats that the campaign has gotten off to a slow start.

Biden lags behind Trump in some polls, and also has the worst approval rating of any modern president at this stage in his term of office.

The president has failed to convince voters the economy is improving, while migration remains a headache and US support for Ukraine and Israel remains divisive among voters.

But perhaps Biden's biggest vulnerability is his age: as America's oldest-ever president, he has suffered a series of trips and verbal slips.

Biden however warned that the biggest issue of all was Trump, saying that "your freedom is on the ballot."

"Today I make this sacred pledge to you that the defense, protection and preservation of American democracy will remain, as it has been, the central cause of my presidency."

He accused Trump of being "sick" by laughing at a hammer attack on the husband of former US House speaker Nancy Pelosi, and called him a "loser" over the 2020 election.

Biden also lashed out at Trump for his "love letters" to North Korean leader Kim Jong-un and his "admiration" for Russian President Vladimir Putin.

- 'Threat to democracy' -

The Trump campaign swiftly hit back.

"Biden is the real threat to democracy by weaponizing the government to go after his main political opponent and interfering in the 2024 election," Trump spokesman Steven Cheung told AFP.

Trump was impeached but acquitted over the January 6 riots. The 77-year-old now faces a criminal trial on charges of trying to subvert the 2020 election.

The US states of Colorado and Maine have also barred him from standing in presidential primaries on the grounds that he had engaged in insurrection over the Capitol events. Trump has challenged both rulings.

Biden's campaign has however identified Trump as their likely opponent, even though the official battle for the Republican nomination doesn't even start until the Iowa caucuses on January 15.

Earlier at Valley Forge, Biden attended a wreath laying session and visited a cottage used by America's first president.

Biden's campaign push will continue Monday when the president visits a South Carolina church where a white supremacist shot dead nine Black parishioners in 2015.

Analysts say the 2024 US presidential election remains a very tight race.

"If the election were held tomorrow, President Biden would lose," William Galston, senior fellow at the Brookings Institution, told AFP.

F.Moura--PC