Members of the news media wait for midterm election results in the briefing room at the White House in Washington. (EPA Images pic)WASHINGTON: President Donald Trump's White House said Tuesday it was in a defiant mood despite a likely hammering in the US midterm elections - warning Democrats to "buckle up" and blaming some Republican candidates.

The 80-year-old president himself had appeared agitated before the first results even came in, posting a string of angry messages on social media lashing out at conservative broadcaster Fox News's coverage.

But after initially saying Trump was "cautiously optimistic," the mood music changed as Democrats looked increasingly likely to deal the president a bruising setback that could upend his last two years in power.