United States President Donald Trump has announced Brett Kavanaugh for the Supreme Court, setting the stage for a bruising confirmation battle.

In a primetime announcement at the White House, Mr Trump praised his pick as a "brilliant jurist".

The nominee, a District of Columbia appeals court judge, is a former adviser to ex-President George W Bush.

The decision has far-reaching implications for America on everything from abortion to guns to immigration.

This is Mr Trump's second appointment to the highest court in the land, potentially allowing him to shape the US for a generation after he leaves office.

The president said "Judge Kavanaugh has impeccable credentials, unsurpassed qualifications and a proven commitment to equal justice under the law. He is a brilliant jurist with a clear and effective writing style, universally regarded as one of the finest and sharpest legal minds of our time."

With reality television-style suspense, the president had kept everyone guessing up until the last moment.

The appointee would replace 81-year-old Justice Anthony Kennedy who announced last month that he will retire this summer.

At Monday night's announcement in the East Room, the 53-year-old Judge Kavanaugh said, "Mr President, thank you. Throughout this process I have witnessed firsthand your appreciation for the vital role of the American judiciary. I am grateful to you and I am humbled by your confidence in me."