Republican presidential candidate Donald Trump has ignored a request by Queen guitarist Brian May to stop using the band's song We Are the Champions at his rallies.

The billionaire businessman entered the auditorium of the Quicken Loans Arena in Cleveland with the 1977 anthem blasting out in the background.

After receiving previous reports that Trump was using the classic hit, May wrote: "This is not an official Queen statement, but I can confirm that permission to use the track was neither sought nor given."

He added: "We are taking advice on what steps we can take to ensure this use does not continue. Regardless of our views on Mr Trump's platform, it has always been against our policy to allow Queen music to be used as a political campaigning tool.

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"Our music embodies our own dreams and beliefs, but it is for all who care to listen and enjoy."

A tweet on Queen's official feed said: "An unauthorised use at the Republican Convention against our wishes - Queen."

The Queen guitarist's letter has no legal power and Trump is free to continue using the track.

Trump walked onto the stage last night in a rock star-style entrance where he introduced his wife, Melania, who made an impassioned speech on her husband's behalf.

Unfortunately for the former Slovakian model, some of the content was lifted from a 2008 speech made by Michelle Obama during the Democratic National Convention which nominated her husband to the White House.

While Mrs Trump has often joined Donald on the campaign trail, delivering short addresses to the crowds at his rallies across the country, she has never spoken at such length, or in such depth, about herself or her husband.

And yet she addressed the crowd in Cleveland for over half an hour with barely a stutter or misstep, waxing lyrical about her childhood in Slovenia, her journey to America, and her experience with the Donald, both as a wife and as a mother.

Trump appeared on stage to introduce his 46-year-old wife Melania, right, for her first major speech. Photo / AP
Trump appeared on stage to introduce his 46-year-old wife Melania, right, for her first major speech. Photo / AP

After the speech Donald joined her on stage where the two shared and embrace and a kiss on the cheek before making their way back to the waiting motorcade outside, their task - for the time being at least - accomplished.

No sooner had the poised, 46-year-old former model delivered her speech to cheering delegates at the Republican National Convention than the unmistakeable similarities to a passage from Mrs Obama's speech to the 2008 Democratic convention came to light.

In both passages, the women are introducing themselves to the American public by speaking of the values that have shaped their lives.

Last night, Mrs Trump said: "My parents impressed on me the values: that you work hard for what you want in life. That your word is your bond and you do what you say and keep your promise. That you treat people with respect. They taught me to show the values and morals in my daily life. That is the lesson that I continue to pass along to our son.

"And we need to pass those lessons on to the many generations to follow. Because we want our children in this nation to know that the only limit to your achievements is the strength of your dreams and your willingness to work for them."

In her speech, Michelle Obama said: "And Barack and I were raised with so many of the same values: that you work hard for what you want in life; that your word is your bond and you do what you say you're going to do; that you treat people with dignity and respect, even if you don't know them, and even if you don't agree with them.

"And Barack and I set out to build lives guided by these values, and pass them on to the next generation. Because we want our children - and all children in this nation - to know that the only limit to the height of your achievements is the reach of your dreams and your willingness to work for them."

In an effort to diffuse the controversy, Jason Miller, Trump's senior communications adviser said: "In writing her beautiful speech, Melania's team of writers took notes on her life's inspirations, and in some instances included fragments that reflected her own thinking.

"Melania's immigrant experience and love for America shone through in her speech, which made it such a success."