Supreme Court nominee Brett Kavanaugh previously voted against giving an undocumented teen access to abortion

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• Brett Kavanaugh has been nominated to succeed Anthony Kennedy, who was a swing vote in favor of abortion rights.
• Kennedy's retirement has sparked fears that the Supreme Court would roll back abortion rights for women in the US.
• Kavanaugh has never publicly mentioned his opinions on abortion, but he recently wrote against a decision to let an undocumented teenager seek an abortion while in custody.

Supreme Court nominee Brett Kavanaugh previously voted against giving an undocumented teen access to abortion in a key case, which may provide insight into his opinions of abortion rights in the US.

In a high-profile case involving abortion late last year, Kavanaugh wrote in dissent of a decision from the DC Circuit's full bench to permit a 17-year-old undocumented immigrant to seek an abortion while in federal custody.

The Trump administration had denied the teen's request, saying it did not want to be "facilitating" abortions for unaccompanied minors. Kavanaugh argued that the majority "badly erred" in their decision to allow the process anyway.

He characterized the ruling as creating a new right for undocumented immigrant minors in US custody to receive "immediate abortion on demand."

Kavanaugh, along with two GOP-appointed colleagues wrote: "The Government has permissible interests in favoring fetal life, protecting the best interests of a minor, and refraining from facilitating abortion," adding that the decision was "a radical extension of the Supreme Court's abortion jurisprudence."

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Donald Trump with Brett Kavanaugh and his family on Monday.

This previous case may indicate how he could rule in future cases involving abortion.

The retirement of Anthony Kennedy, the justice whom Kavanaugh was chosen to replace, has prompted speculation that the Supreme Court could roll back abortion rights under the Trump administration.

Kennedy has long been a swing vote to in favour of abortion rights. Trump has said he would appoint a justice who would reverse Roe v Wade, a landmark 1973 case that granted women in the US the right to have abortions across the country.

During a hearing on his nomination to the DC Circuit Court of Appeals, Kavanaugh declined to give his personal opinion on Roe v Wade, saying only that he would uphold the Supreme Court's current decision on the case.

Watch the exchange below:

In October 2016, then-candidate Trump said when asked about whether he would overturn Roe v Wade: "If we put another two or perhaps three justices on, that's really what's going to be - that will happen.

"And that'll happen automatically, in my opinion, because I am putting pro-life justices on the court. I will say this: It will go back to the states, and the states will then make a determination."

Alex Wong/Getty Images; Business Insider

Trump has vowed to put justices on the court and overturn Roe v Wade.

Kennedy's retirement paves the way for Trump's second Supreme Court appointment. Last year the president appointed Neil Gorsuch after the Senate refused to consider Barack Obama's nomination, Merrick Garland, to replace the late Antonin Scalia.

According to the Judicial Common Space, which scores US justices and judges on their ideology, Kavanaugh's ideology falls to the right of Justices Gorsuch and Samuel Alito, but to the left of Clarence Thomas.