US President Donald Trump apologised to Associate Supreme Court Justice Brett Kavanaugh and his family "on behalf of our nation" for what he called a desperate Democrat-led campaign of "lies and deception" intent on derailing his confirmation.

Trump remarks came on Monday night during Kavanaugh-s swearing-in ceremony in the East Room of the White House, reports Fox News. "On behalf of our nation, I want to apologise to Brett and the entire Kavanaugh family for the terrible pain and suffering you have been forced to endure," Trump said. "Those who step forward to serve our country deserve a fair and dignified evaluation, not a campaign of political and personal destruction based on lies and deception. What happened to the Kavanaugh family violates every notion of fairness, decency, and due process.