U.S. President Donald Trump celebrated his acquittal on impeachment charges in a caustic, free-wheeling speech on Thursday that drew on White House pomp to underscore the fact that he remained in office.

After walking down a red carpet to a standing ovation from scores of Republican lawmakers, administration officials and conservative media figures in the East Room of the White House, Trump re-aired old grievances and accused Democrats of staging a "corrupt" effort to undermine his presidency in a speech lasting more than an hour.

"I've done things wrong in my life, I will admit ... but this is what the end result is," Trump said, holding up a copy of the Washington Post with the headline "Trump acquitted."