The meme-worthy applaud came after the president's call for unity during his speech - created to call for "cooperation, compromise and the common good" instead of partisan bickering and "the politics of revenge". He added that in Afghanistan "it is time" to press for peace, and refocus US troops on counterterrorism.
He dismissed former Vice President Joe Biden as "dumb", called Sen.
He also will make another pitch for his proposed southern border wall.
Democrats call the wall a waste of money, ineffective and immoral.
But there will be plenty more to keep an eye - and ear - on as Trump addresses a joint session of Congress.
Stacey Abrams steps into the brightest spotlight of her political career Tuesday night with a speech that will chide President Donald Trump and Republicans for political gamesmanship that hurts working Americans.
For Democrats, these reactions will set off waves of elation.
Her subtle expressions of disapproval provided a stark contrast to Vice President Mike Pence, who often is mocked by Democrats for his nearly adoring gazes at Trump. ".trump.pdf">the latest poll from CNN shows that women disapprove of Trump by a roughly 2-to-1 margin.
The president went on to hit out at calls "to adopt socialism" in the US, an apparent reference to the "democratic socialists" who were elected in the 2018 midterms and a message likely to be repeated in the run-up to the 2020 elections. "He's going to lay out the case". The counter-puncher in chief charged Schumer with being "upset that he didn't win the Senate, after spending a fortune, like he thought he would".
Trump highlighted bipartisan successes of the past two years, including criminal justice reform via the First Step Bill legislation, before calling on Republicans and Democrats to come together to tackle "an urgent national crisis" on "our very risky southern border".
That wasn't the only time during his speech that applause was used against him.
Don't expect the president to alter his border wall rhetoric for the prime time address. In an interview with The Nation, Sanders boasted of being called a socialist, "Do they think I'm afraid of the word?"
"Democrats. voted and supported building a wall and putting a barrier on our border". Pelosi packed the gallery with some of Trump's sharpest critics, including Dr Leana Wen, the head of Planned Parenthood; chef Jose Andres, who has become a vocal critic of the administration's immigration policies; and five labor leaders.
"To many people this speech will be remembered for his continued obsession with the wall, the demonization of immigrants, and his freaky attack on congressional investigations". In short, the government might have re-opened, but little has changed. With another shutdown deadline looming, the president has few options for getting Congress to fund a border wall, and he risks further alienating his party if he tries to circumvent lawmakers by declaring a national emergency instead.
Pelosi's goal for Tuesday night, experts said, was to convey firmness and self-control. For Republicans, they will be seen as reflections of a party unwilling to ever give the President the benefit of the doubt.
But there are other topics that might keep Republicans in their seats.
IS militants have lost territory since Trump's surprise announcement in December that he was pulling USA forces out, but military officials warn the fighters could regroup within six months to a year after the Americans leave.
Nancy Pelosi clapped back. And his raucous political rallies show how he reacts to the crowd that he's addressing.
The White House is also considering imposing tariffs of up to 25 percent on imports of automobiles and auto parts.
When the president goes off script, Democrats - and some Republicans - admit they cringe.