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Trump has vowed to cut funding to the United Nations
The President has become increasingly outspoken over his opposition to continued funding of the global body.
He has even gone so far as to argue the UN should remove its headquarters from New York in a devastating blow to relations.
And in January, Republican congressman Mike Rogers put forward his ‘American Sovereignty Restoration Act’, which also seeks a complete withdrawal from membership of the World Health Organisation.
But Portuguese diplomat João Vale de Almeida said the current debate over the future of the country's commitment to the UN was only the starting point.
Trump said the UN should remove its headquarters from New York
He said: “Congress will have a lot to say. There are voices in Congress that have different views from the administration on this.
“The debate is on, it's a legitimate debate, a democratic one which we respect.
"Our message to the Americans is to say: think twice before making the UN irrelevant by defunding it.”
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Our message to the Americans is to say: Think twice before making the UN irrelevant by defunding it
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Portuguese diplomat João Vale de Almeida
The diplomat, who has previous experience working as a US ambassador, said he believed the US funding debate could help generate new and positive ideas on how to make the UN a more efficient and effective body.
But he also warned the world faced new challenges, just days after the Westminster terror attack, and warned no country should try to tackle them alone.
Mr Vale de Almeida said: “We have new threats, new challenges, new actors.
“In a world like this I don't think any single country alone, in isolation, can find solutions to all these problems. We need a multilateral solution.”
Republican Mike Rogers launched a bill to pull US out the UN
Donald Trump has been increasingly outspoken over the United Nations
If the US was to withdraw funding from the international block, the EU would be left holding up the weight.
And many have voiced fears the Brussels bloc’s influence could dwindle once the UK leaves.
However the ambassador highlighted that the bloc was and will remain once of the biggest sources of financial support for the UN.
Mr Vale de Almeida also claimed it could continue to fulfil its role as a key trading partner as well as supplier of developmental and humanitarian aid.
He said: ”We are already contributing a lot.
"We want to make the UN relevant, fit for purpose and useful in addressing some of the most complex issues in today's world.”