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US President Donald Trump's pick for a Supreme Court vacancy will tell senators that she will judge legal cases impartially "whatever my own preferences might be".

Amy Coney Barrett, a conservative jurist, faces a four-day confirmation hearing in the Senate next week.

If approved, Judge Barrett will replace liberal Justice Ruth Bader Ginsburg, who died recently at 87.

Judge Barrett's nomination for the role has proved politically controversial.

It was announced by Mr Trump at the end of September, just weeks before he takes on Democratic rival Joe Biden in November's presidential election.

Should Judge Barrett's nomination be confirmed, conservative-leaning justices will hold a 6-3 majority on the Supreme Court, shifting its ideological balance for potentially decades to come.

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The court's nine justices serve lifetime appointments, and their rulings can shape public policy on everything from gun and voting rights to abortion and campaign finance.

Democrats fear Judge Barrett's successful nomination would favour Republicans in politically sensitive cases that reach the Supreme Court.

Given this, Democrats have urged Judge Barrett to not take part in any cases involving the outcome of November's presidential election and an upcoming challenge to a health law known as Obamacare.

They argue that, because she was nominated by President Trump during an election campaign, it would not be ethical for her to make a judgement on such cases.

Judge Barrett is the third justice to be nominated by the current Republican president, after Neil Gorsuch in 2017 and Brett Kavanaugh in 2018.

What will Judge Barrett tell senators in her opening remarks?

In what is effectively an interview for the job, the confirmation hearing will give Judge Barrett a chance to explain her legal philosophy and qualifications for the lifetime post.

In prepared remarks released ahead of the hearing, Judge Barrett thanked President Trump for "entrusting me with this profound responsibility", which she called the "honour of a lifetime".

In the speech, Judge Barrett, a 48-year-old mother of seven, will speak of the importance of her family and how her parents prepared her for a "life of service, principle, faith, and love".

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Judge Barrett will pay tribute to judges she has worked with, including former Supreme Court Justice Antonin Scalia.

Justice Scalia's reasoning "shaped me", Judge Barrett will say. "His judicial philosophy was straightforward: A judge must apply the law as written, not as the judge wishes it were."

Judge Barrett will say it is for elected politicians to make "policy decisions and value judgments", not Supreme Court justices.

"In every case, I have carefully considered the arguments presented by the parties, discussed the issues with my colleagues on the court, and done my utmost to reach the result required by the law, whatever my own preferences might be," Judge Barrett will say.

"When I write an opinion resolving a case, I read every word from the perspective of the losing party. I ask myself how would I view the decision if one of my children was the party I was ruling against."

What's the confirmation process?

After the conformation hearing, the Senate - the upper chamber of the US Congress - will vote to confirm or reject Judge Barrett's nomination.

Republicans hold a slim majority, but they already appear to have the 51 votes needed to get Judge Barrett confirmed.

Senate majority leader Mitch McConnell has vowed to hold a confirmation vote before the 3 November election.

Barring a surprise, Democrats seem to have few procedural options to prevent her gliding through the Senate to the Supreme Court bench.

Why Judge Barrett's nomination so controversial?

Since Ginsburg's death from cancer on 18 September, Republican senators have been accused of hypocrisy for pressing ahead with a Supreme Court nomination during an election year.

In 2016, Mr McConnell refused to hold hearings for Democratic President Barack Obama's nominee for the court, Merrick Garland.

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The nomination, which came 237 days before the election, was successfully blocked because Republicans held the Senate and argued the decision should be made outside of an election year.

This time around, Mr McConnell has lauded Judge Barrett's nomination, saying the president "could not have made a better decision."

Democrats say the Republicans should stand by their earlier position and let voters decide.

Mr Biden has called Mr Trump's efforts to appoint a justice an "abuse of power".

Who is Amy Coney Barrett?

After graduating from Notre Dame University Law School in Indiana, she clerked for the late Justice Antonin Scalia. In 2017, she was nominated by Mr Trump to the Chicago-based 7th Circuit Court of Appeals.

She is described as a devout Catholic who, according to a 2013 magazine article, said that "life begins at conception". This makes her a favourite among religious conservatives keen to overturn Roe v Wade, which legalised abortion in the US.

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LGBT groups have criticised her membership of a conservative Catholic group, People of Praise, whose network of schools have guidelines stating a belief that sexual relations should only happen between heterosexual married couples.

Judge Barrett has ruled in favour of President Trump's hardline immigration policies and expressed views in favour of expansive gun rights.

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