Yesterday Elizabeth Warren established herself as a heroine of the anti-Trump movement - but her dislike of the new American President is far more deep-rooted.

By reading out a letter from the widow of Martin Luther King Jr to protest the nomination of Jeff Sessions as attorney-general, Warren struck at the heart of Team Trump. Her subsequent silencing has only burnished her reputation, making her a martyr for the masses who oppose the new occupant of the White House.

But yesterday's attack on Mr Trump is nothing compared to the explosive warning Warren published on Facebook back in March, months before the US Presidential election.

The letter, which is still pinned to her Facebook page, derides Mr Trump as a serial loser and says he will tear apart America.

Warren's letter is reproduced in full below. To see the post on her Facebook page and view her full profile, simply click here.

(Mr Trump defends his resort to bankruptcy, saying he simply took advantage of the US legal system, and he has paid $25 million to settle three lawsuits against Trump University).

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Let’s be honest – Donald Trump is a loser.

Count all his failed businesses. See how he kept his father’s empire afloat by cheating people with scams like Trump University and by using strategic corporate bankruptcy (excuse me, bankruptcies) to skip out on debt.

Listen to the experts who’ve concluded he’s so bad at business that he might have more money today if he’d put his entire inheritance into an index fund and just left it alone.

Trump seems to know he’s a loser. His embarrassing insecurities are on parade: petty bullying, attacks on women, cheap racism, and flagrant narcissism. But just because Trump is a loser everywhere else doesn’t mean he’ll lose this election. People have been underestimating his campaign for nearly a year – and it’s time to wake up.

People talk about how "this is the most important election" in our lifetime every four years, and it gets stale. But consider what hangs in the balance.

Affordable college. Accountability for Wall Street. Healthcare for millions of Americans. The Supreme Court. Big corporations and billionaires paying their fair share of taxes. Expanded Social Security. Investments in infrastructure and medical research and jobs right here in America. The chance to turn our back on the ugliness of hatred, sexism, racism and xenophobia. The chance to be a better people.

More than anyone we’ve seen before come within reach of the presidency, Donald Trump stands ready to tear apart an America that was built on values like decency, community, and concern for our neighbours. Many of history’s worst authoritarians started out as losers – and Trump is a serious threat.

The way I see it, it’s our job to make sure he ends this campaign every bit the loser that he started it.