MPs and peers have launched a campaign to block President Trump from addressing parliament, accusing him of being a 'liar' who has disrespected Britain.
The US president has suggested the King, who he called his 'friend' and will formally host the state visit, is looking at 'setting a date for September'.
In February, Sir Keir Starmer invited Trump to Britain as part of a charm offensive designed to strengthen relations and secure a trade deal with the US.
But some parliamentarians are working to stop him giving a speech in Westminster, as Barack Obamadid in 2011.
Trump was also controversially blocked from speaking during his first state visit by former speaker John Bercow.
MPs now claim Trump was not acting in 'good faith' towards Britain due to tariffs levied by the US on all imports - particularly aluminium, steel and cars - with the threat of more to follow on pharmaceutical products.
A message sent to Lord McFall of Alcluith, the Lord Speaker, said it would be 'inappropriate' for Trump to speak in the Palace of Westminster.
Co-ordinated by Lord Foulkes of Cumnock, a minister in Tony Blair's government who later served on parliament's intelligence and security committee, it responded to the suggestion the state visit would be in September.
MPs are trying to ban Trump from speaking to Parliament once again despite former President Obama giving a speech to Westminster Hall in 2011
The US president has suggested the King, who he called his 'friend' and will formally host the state visit, is looking at 'setting a date for September' (pictured in 2019)
Sir Keir Starmer invited Trump to Britain as part of a charm offensive designed to strengthen relations and secure a trade deal with the US in February
The message said: 'If it is suggested that he be invited to address both Houses of Parliament, I hope that you and Lindsay will suggest that would be inappropriate on this occasion because of his attitude towards and comments about the UK, parliamentary democracy, the Nato Alliance and Ukraine.'
MPs are also privately lobbying Sir Lindsay Hoyle, the Commons Speaker. Kate Osborne, a Labour MP and former member of the women and equalities select committee, asked Hoyle to mirror John Bercow's previous decision to block Trump.
In a letter seen by The Times, she wrote: 'I am asking you as the Speaker to agree it would be inappropriate and mirror the previous Speaker's recommendation.
'It is up to our government to decide if they use the state visit to engage with Trump on a wide range of issues as above but that does not translate to giving him the honour of addressing parliament. The risk of low attendance could also have negative or unintended consequences.'
Another Labour MP said: 'Parliament has nothing to learn from a serial liar, cheat, womaniser and bankrupt. We don't need Trump to lecture and dictate his unilateral terms to our elected representatives.'
This campaign comes days after Trump told reporters in the Oval Office he 'was invited by the King and the great country' who are doing a 'second fest' which will be 'beautiful'.
He said: 'It is the second time is has happened to one person. The reason is we have two separate terms and it's an honour to be a friend of King Charles and the family, William.'
Mr Trump added: 'I think they are setting a date for September. I don't know how it can be bigger than the last one. The last one was incredible but they say the next one will be even more important.'
The Lord Speaker Lord McFall of Alcluith was sent a message that it would be 'inappropriate' for Trump to speak in the Palace of Westminster
Lord Foulkes of Cumnock co-ordinated the letter to Lord McFall whileMPs are also privately lobbying Sir Lindsay Hoyle, the Commons Speaker
During his first spell in the White House, Mr Trump visited both Windsor Castle and Buckingham Palace to meet Queen Elizabeth II
Labour MPs have sought to avoid criticising the US president openly to avoid making Starmer's job harder as he seeks to keep Trump on side in trade negotiations.
Government sources said the UK was pressing to get a deal as soon as possible, and was 'desperate' to do so before May 19.
The date has been pencilled in as a big moment in Starmer's 'EU reset', when he will host Ursula von der Leyen, president of the European Commission.
A government insider said: 'Trump hates the EU, so we're desperate to get a deal with him locked in before what will inevitably be a love-in with Brussels.'
Some 75 Labour MPs backed a campaign to block the US president from addressing parliament during his first term.
An early day motion in 2019 was signed by several foreign office ministers, as well as those now in the cabinet.
They include Wes Streeting, the health secretary; Jo Stevens, the Welsh secretary; Lucy Powell, leader of the Commons; and Ellie Reeves, chairwoman of the Labour party.
In 2011, both houses of parliament invited Obama to address an audience of hundreds in Westminster Hall. Standing at a lectern in front of a red carpet, he was watched on by then prime minister David Cameron, and his predecessors Tony Blair, Gordon Brown and Sir John Major.
Health Secretary Wes Streeting was one of 75 Labour MPs who backed a campaign to block the US president from addressing parliament during his first term
In 2023, President Zelensky of Ukraine gave a speech in Westminster Hall about the Russian invasion
The three 'keyholders' of Westminster Hall, where foreign leaders usually address Parliament, are the Commons Speaker, the Lord Speaker and the Lord Great Chamberlain, who is represented by Black Rod.
All three have to agree for a visit to take place, after a request is made by the Government.
Senior sources confirmed to The Mail on Sunday in February that this time both the Lord Speaker and Commons Speaker would welcome a visit.
In 2023, President Zelensky of Ukraine gave a speech in Westminster Hall about the Russian invasion.
There have been 80 addresses to members of both Houses of Parliament since 1935.
Eleven of these were from the monarch but most have been foreign leaders. These include Ronald Reagan in 1982 and Bill Clinton in 1995.
