NEW YORK — In a combative and freewheeling news conference, President-elect Donald Trump said for the first time Wednesday that he accepts Russia was behind the election year hacking of Democrats that roiled the White House race. Looking ahead, he urged Congress to move quickly to replace President Barack Obama’s signature health care law and insisted anew that Mexico will pay the cost of a border wall.

The hour-long spectacle in the marbled lobby of Trump’s Manhattan skyscraper was his first news conference since winning the election in early November, and the famously unconventional politician demonstrated he had not been changed by the weight of his victory.

He defiantly denied reports that Russia had collected compromising personal and financial information about him, lambasting the media for peddling “fake news” and shouting down a journalist from CNN, which reported on the matter. His family and advisers clapped and cheered him on throughout.

Trump’s transition has been shadowed by U.S. intelligence assessments that Russia not only meddled in the election, but did so to help him defeat Democrat Hillary Clinton. After spending weeks challenging that idea, Trump finally accepted at least part of the intelligence conclusions.

“As far as hacking, I think it was Russia,” Trump said, quickly adding that “other countries and other people” also hack U.S. interests. Still, he kept needling the intelligence agencies, saying it would be a “tremendous blot” on their record if officials were leaking information from his classified briefings.

Director of National Intelligence James Clapper said in a statement later that he had spoken with Trump Wednesday evening and told him he does not believe any leaks came from the intelligence community.

One U.S. official told The Associated Press Tuesday night that intelligence people had informed Trump last week about an unsubstantiated report that Russia had compromising personal and financial information about him. Some media outlets reported on the document, which contains unproven information alleging close coordination between Trump’s inner circle and Russians, as well as unverified claims about unusual sexual activities by Trump. The AP has not authenticated any of the claims.