The Prime Minister will this afternoon meet the new US President in the White House, becoming the first world leader to hold face-to-face talks with the businessman-turned-politician since his inauguration.
Last night, Mrs May hailed the "unique and special relationship" between Britain and the US in a speech to a Republican Party conference in Philadelphia.
Professor Ted Malloch, currently the top contender to be named President Trump’s top diplomat in Brussels, revealed Mrs May’s address had been awarded “high marks”.
He told Express.co.uk: “She talked about renewal of the special relationship. She really stepped out on a right foot.
“The reviews in American papers are, frankly, generally all very positive.”
He contrasted this with the "frosty" relationship between President Trump and German Chancellor Angela Merkel.
Donald Trump & Theresa May have established early ties – while Angela Merkel has 'frosty' relations
President Trump’s team have also been left pleased by the speed with which Mrs May has made her visit to the US, Professor Malloch added.
It has been just a week since the billionaire took the oath of office.
He said: “It was truly a desired end on both sides, that’s why it happened.
“I’m not saying there were months and months of preparation, there clearly couldn’t have been.
“So it was put together fairly quickly. There was a strong willingness.”
Theresa May is Donald Trump’s favourite European leader
Describing how President Trump has a “different point of view” on world politics to predecessor Barack Obama, along with Mrs May’s need for post-Brexit trade deals, Professor Malloch claimed the meeting was “a statement on political realities”.
He added: “Two world leaders meeting in the Oval Office one-on-one. That’s a pretty powerful scenario.”
Professor Malloch, of Henley Business School, revealed first impressions are “very important” to President Trump, who he described as "very dedicated" and a "workaholic" who only sleeps for four hours per night.
He insisted both President Trump and Mrs May will need each other as close allies, adding: “It would help if there were more than an ounce of chemistry.
“I know that Trump one-on-one can be very charming. I hope that she comes out of her shell and they can have the beginning of a personal chemistry.
“There’s going to be a renewed US-UK relationship so it would be helpful… if the personal characteristics of the two players fit.”
May meets Trump: Historic first meeting in pictures
Fri, January 27, 2017
The two leaders will spend about an hour in face-to-face talks in the Oval Office, where President Trump has restored a bust of Winston Churchill removed by predecessor Barack Obama.
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Prime Minister Theresa May speaks during the 2017
The ex-United Nations ambassador and World Economic Forum employee said, following the pair’s meeting, he expected announcements on a prospective trade deal, transatlantic security and President Trump’s proposed visit to Britain later this year.
The lead-up to Mrs May’s trip to Washington D.C. has been dominated by President Trump’s suggestion he could bring back the use of torture on terror suspects, which Mrs May strongly opposes.
Professor Malloch suggested President Trump would be ”respectful” of criticisms raised in private, but added: “The whole thing should be about positivity, good energy, the future. If she wants to make some comparison, contrast some differences, I think she’ll do that in private.”
He described the fact the Prime Minister is the first world leader to meet President Trump in the White House as “significant” as “other people were asking and have been asking”.
The author compared Mrs May’s early relationship with President Trump with the “differences” the US leader shares with Mrs Merkel.
He said: “To be honest, let’s put it bluntly, Mrs Merkel was Barack Obama’s favourite European leader. Theresa May is Donald Trump’s favourite European leader.”
Ted Malloch is the top contender to be named President Trump's EU ambassador
Professor Malloch described President Trump’s relationship with Mrs Merkel as “frosty”, with the two leaders expected to speak by telephone tomorrow.
He said: “They do have some significant differences. To a degree she continues to argue for globalism and for the defending of the all-powerful supranational European Union.
Professor Malloch noted how President Trump has already criticised Germany’s influence over the EU and the tilting of the euro single currency in Berlin’s favour, but suggested there would not be a “big diplomatic rift” between the pair.
He said: “It’s not in Germany’s interest to have such a big rift and frankly on the question of transatlantic relations and security, I think there’s more commonality than discord.”