President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Tuesday evening tore into the Democratic Party ahead of the 2018 midterm elections, referring to them by the label "Pelosi Democrats" during a fundraiser speech in Washington, D.C.

“These days there are no such thing as a Blue Dog Democrat, a red-state Democrat or a conservative Democrat because they are all Pelosi Democrats," Trump said during a speech at a dinner organized by the National Republican Congressional Committee (NRCC), referring to House Minority Leader Nancy Pelosi Nancy PelosiAs families deal with coronavirus, new federal dollars should follow the student Sunday shows - Ruth Bader Ginsburg's death dominates Hypocrisy rules on both sides over replacing Justice Ginsburg MORE (D-Calif.).

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"Weak on crime, weak on terrorism, and weak on national defense," he said of the rival party. “Democrats like to campaign as moderates but they always govern like radicals."

The president vowed to hit the campaign trail for Republicans in the coming months.

"That is why I am going to campaign all across this country to elect Republicans so that we can reduce taxes further, reduce crime, increase jobs and make our communities safe and prosperous and secure," Trump said. "Our opponents are fielding the most candidates they've ever had in a quarter century. Many have not held office before, which means it will be easier for them to conceal their true beliefs.

"That's why we must tell the truth over and over again. A vote for a House Democrat is a vote for higher taxes, open borders and the destruction of American jobs and American wealth. It's also the destruction of the American dream," he continued.

Trump warned Republicans about becoming complacent in the upcoming races, saying the party has too much to lose.

"For some reason when a party wins the presidency ... what happens is they lose two years later," he said. "It's called complacency."

"We cannot be complacent. We can't. We have so much to gain, and this country has so much to lose."

Republicans and Democrats across the U.S. are gearing up for the midterm elections in November, in what is being framed by many as a referendum on the first two years of Trump's presidency.

Recent polls suggest Democrats have the upper hand over Republicans going into the elections.

An NBC News/Wall Street Journal poll on Sunday found that 50 percent of voters said they preferred Democrats ahead of the midterm contests, while 40 percent said they favored Republicans.

Republicans have also struggled with an exodus of House members leaving Congress this year.

Thirty-eight Republicans have announced they will leave the lower chamber, but White House press secretary Sarah Huckabee Sanders downplayed the exits on Tuesday.

"We're not concerned. Right now, we think we've got a great story to tell after the first year of being in office, and we look forward to communicating that to the American people and continuing to push the president's agenda," Sanders said.