President Donald Trump said Tuesday in a speech for the National Republican Congressional Committee that moderate or conservative Democrats no longer exist.

Trump said Democrats campaign as moderates but govern as radicals, and he pledged to support GOP candidates during the midterm elections this year.

"Democrats like to campaign as moderates, but they always govern like radicals," Trump said. "That is why I am going to campaign all across this country to elect Republicans so that we can reduce taxes and further reduce crime, increase jobs, and make our communities safe and prosperous and secure."

He said electing Democrats only serves the agenda of House Minority Leader Nancy Pelosi (D., Calif.), even if the candidates running say they do not support her.

"It doesn't matter what Democrat candidates say on the campaign trail because once Democrats get to Washington, they always do the same thing: They vote for the liberal Pelosi agenda down the line, straight down the line, every single time," he said.

Democratic dissatisfaction with Pelosi has been growing recently, as candidates of different kinds have begun courting voters by running against Pelosi. Pelosi maintains that the party still needs her leadership.

Trump also knocked the Blue Dog Coalition as a nonentity, arguing that Democrats do not have a conservative wing anymore.

"These days, there's no such thing as a Blue Dog Democrat, a red-state Democrat, or a conservative Democrat because they are all Pelosi Democrats," he said. "Weak on crime, weak on terrorism, and weak on national defense."

"We're going to keep criminals off our streets, and terrorists—we're going to keep them the hell out of our country," he added.

He said the grassroots movement among Democrats may be able to fool voters but that Republicans should stick to their message on the economy and national security.

"Our opponents are fielding the most candidates they've had in a quarter century," he said. "Many have not held office before, which means it will be easier for them to conceal their true beliefs. We’re not going to know anything about these people. 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."