WASHINGTON, Oct 14 (Reuters) - President Donald Trump's Supreme Court nominee Amy Coney Barrett on Wednesday said it is an "open question" as to whether Trump could pardon himself while adding that the top U.S. judicial body "can't control" whether a president obeys its decisions.

On the third day of her four-day Senate Judiciary Committee confirmation hearing, Barrett also sought to allay Democratic fears that she would be an automatic vote to strike down the Obamacare healthcare law in a case due to be argued Nov. 10, promising an "open mind."

Trump has said he has the "absolute power" to pardon himself, part of his executive clemency authority. Asked by Democratic Senator Patrick Leahy whether a president could pardon himself for a crime, Barrett said the "question has never been litigated."

"That question may or may not arise but it's one that calls for legal analysis of what the scope of the pardon power is. So because it would be opining on an open question when I haven't gone through the judicial process to decide it, it's not one on which I can offer a view," Barrett added.

Trump faces a criminal investigation into the conduct of himself and his businesses by a New York City prosecutor who is seeking his financial records and tax returns. Trump also has issued executive clemency to political allies and friends.

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Barrett, a conservative federal appellate judge, is Trump's third selection for a lifetime Supreme Court post. Trump has asked the Senate, controlled by his fellow Republicans, to confirm Barrett before the Nov. 3 U.S. election.

While saying "no one is above the law," Barrett twice declined to answer directly when Leahy asked whether a president who refuses to comply with a court order is a threat to the U.S. constitutional system of checks and balances within the three branches of government.

Watch a livestream of the third day at 8 a.m. CDT:

"The Supreme Court can't control whether or not the president obeys," Barrett said.

Supreme Court rulings, Barrett said, have the "force of law" but the court lacks enforcement power and relies on the other branches of government.

"A court can pronounce the law and issue a judgment but it lacks control over how the political branches respond to it," Barrett added.

Barrett declined to discuss whether Trump is violating the U.S. Constitution's "emoluments" clause with his business dealings. The provision bar presidents from taking gifts or payments from foreign and state governments without congressional approval.

"I don't know if I would characterize it as an anti-corruption clause," Barrett said, disagreeing with Leahy, adding that it was designed to "prevent foreign countries from having influence."

OBAMACARE CASE

Barrett could be on the high court for arguments in a challenge by Trump and Republican-led states to the 2010 law formally called the Affordable Care Act (ACA) that has helped millions of Americans obtain medical coverage and includes protections for people with pre-existing conditions.

Responding to Democratic suggestions that she would vote to strike down Obamacare in its entirety if one part is deemed unlawful, Barrett said if a statute can be saved, it is a judge's duty to do so.

Barrett indicated she favors of a broad reading of the "severability doctrine" under which courts assume that when one provision of a law is unlawful, Congress would want the rest to remain in place. The Supreme Court has taken such an approach in recent years.

When judges address the legal question raised in the Obamacare case, the "presumption" is that Congress did not intend the whole statute to fall, Barrett added.

"If I were on the court, and if a case involving the ACA came before me, I would approach it with an open mind," Barrett told Republican Senator John Cornyn.

Barrett has criticized previous Supreme Court rulings upholding Obamacare.

ABORTION RIGHTS

Barrett, 48, would be the fifth woman ever to serve on the court. As a devout Catholic, Barrett personally opposes abortion.

"This is history being made folks," said Republican Senator Lindsey Graham, chairman of the panel. "This is the first time in American history that we've nominated a woman who is unashamedly pro-life and embraces her faith without apology, and she's going to the court."

Barrett reiterated her Tuesday comments that the landmark 1973 Roe v. Wade ruling that legalized abortion nationwide was not a "super-precedent" that could never potentially be overturned.

She would not say if the landmark 1965 Griswold v. Connecticut ruling that protects the right of married couples to use contraceptives without government restrictions was properly decided, but said it is "very unlikely" to be imperiled.

Some conservatives including Barrett's mentor, the late Justice Antonin Scalia, have criticized the ruling, which recognized a right to constitutional privacy and paved the way for Roe v. Wade as well as rulings recognizing LGBT rights.

Barrett also declined to give her view on whether human activities contribute to global climate change.

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Barrett's confirmation would give the court a 6-3 conservative majority. Republicans have a 53-47 Senate majority, making Barrett's confirmation a virtual certainty.

The hearing was twice interrupted by problems with the hearing room's microphones.

The four-day hearing is scheduled to end on Thursday with testimony from outside witnesses. Republicans are preparing for a committee vote next week and a final Senate confirmation vote before the end of October. Trump nominated Barrett on Sept. 26 to replace the late liberal Justice Ruth Bader Ginsburg.

(Reporting by Andrew Chung in New York and Lawrence Hurley and Patricia Zengerle in Washington; Editing by Will Dunham)