WASHINGTON (REUTERS) - With the impeachment drive against him ebbing, US President Donald Trump will face his Democratic accusers on Tuesday night (Feb 4) at a State of the Union speech, where he is expected to push his case for another four years in office.

Mr Trump, a Republican, may be tempted to lash out at the Democratic critics seated before him in the House of Representatives, seeing it as a chance for payback against those who sought to oust him through what he calls a "witch hunt". Some of his aides and allies, however, are pressing for him to avoid a confrontation.

The Republican-led Senate is almost certain to end the impeachment drive on Wednesday with a vote to acquit him. His speech, which starts at 9pm on Tuesday (10am Wednesday Singapore time), affords Mr Trump the opportunity to advance his message for what is likely to be a hard-fought battle for re-election on Nov 3.

Aides say there has been an internal debate inside the White House over whether he should even bring up impeachment in his speech.

A senior administration official said on Monday night that Mr Trump was not expected to delve deeply into the issue, if at all, but acknowledged that this could always change.

Mr Trump himself has said he plans an upbeat speech offering an optimistic vision at a time when Washington - and the rest of the country - is polarised over his leadership.

"We're really looking to giving a very, very positive message," he told reporters during a Super Bowl party at his golf club in West Palm Beach, Florida, on Sunday.

Senator Pat Roberts, a Kansas Republican and strong Trump supporter, told reporters on Capitol Hill on Monday that Mr Trump would help himself by taking the high road.

"I hope he will smother people with the milk of human kindness," Mr Roberts said.

Asked if Mr Trump could turn impeachment to his advantage by being gracious about it going forward, Mr Roberts said, "Could. Some of us have urged that."

The theme of Mr Trump's speech is "The Great American Comeback". He plans to highlight the strength of the US economy and achievements to support it, such as a China trade deal and another trade pact with Mexico and Canada.

He is also expected to offer to work with his political opponents on issues like reducing healthcare costs and drug prices and rebuilding infrastructure, officials said.

But with the two parties immersed in election-year politicking, no major legislative action is expected this year.

Mr Trump is expected to contrast his vision for healthcare with the plans advanced by his Democratic rivals, a reference to left-leaning proposals by two of the Democratic presidential candidates he frequently attacks, senators Bernie Sanders and Elizabeth Warren.

He is also expected to promote his efforts to limit migrants from crossing the southern US border, as well as national security moves such as his decision to kill Iranian military commander Qassem Soleimani with a US drone strike.

Still, the President held out little hope for bipartisan cooperation this year in the wake of the impeachment fight, saying he doubted that Democrats would want to work with him.

"I'm not sure that they can do it, to be honest," Mr Trump told the Fox network in a Super Bowl Sunday interview.

The State of the Union speech is attended by Democratic and Republican lawmakers from both the House and the Senate as well as such VIP guests as Cabinet secretaries and Supreme Court justices. The television audience for last year's speech was estimated at 47 million people.