Sen. Bernie Sanders (I-Vt.) took aim squarely at President Donald Trump during an appearance Monday at the AFL-CIO’s annual Labor Day breakfast in Manchester, New Hampshire.

He declared, “We have a president, and I say this with no joy in my heart, who is a pathological liar.”

Sanders said the president “works night and day on behalf of his fellow billionaires,” adding, “We have a president for cheap political reasons who is trying to divide us up,” as many outlets, including The Hill, reported.

He also said Trump has been teaching people to “hate other people because they may have been born in a different country, color of their skin is different, their religion is different, their sexual orientation may be different.”

The senator also repeatedly claimed that the Republican majority in the Senate and House “are exactly on the wrong side of where the American people are.”

The senator from the Green Mountain State energized liberals across the nation as he battled fellow candidate Hillary Clinton in the 2016 primaries. (He pummeled Clinton in the New Hampshire primary, but Clinton went on to gain the presidential nomination.) He sparked more speculation about his possible 2020 presidential ambitions, headlining the annual Labor Day breakfast for the fifth year in a row.

“We need to stand together and we will not allow Trump or anybody else to divide us up based on color of our skin, our religion, our nationality, or our sexual orientation,” he said, as Fox News reported. “When we stand together, we win. When they divide us up, they win.”

Sanders, who is running for re-election in Vermont this November for a third term in the Senate, highlighted his progressive agenda — including Medicare for All and a $15 per hour minimum wage.

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The senator also pushed for strengthening Social Security, addressing income equality, and writing new gun laws during his speech.

Related: Sen. Bernie Sanders, Meet Sen. Bernie Sanders

“We come from rural states, New Hampshire and Vermont,” he said.

“And a lot of our people hunt and own guns. But I believe that in our states and throughout this country, the overwhelming majority of the American people support common-sense gun safety legislation.”

Many in the room supported Sanders’ words.

“When we stand together, we win. When they divide us up, they win.”

“I think Bernie’s message is spot on — we need to come together, and we’ll figure out the way to do that [Sanders’ platform] with whomever is leading the charge,” said Andru Volinsky, who served as legal counsel and a member of the steering committee for Sanders’ campaign in New Hampshire, reported Fox News.

“It will take a little bit to work out, but I think we’re going to be fine.”

See more on Sanders’ insults against the president in the video below: