Washington (CNN) President Donald Trump railed Tuesday against billionaire conservative brothers Charles and David Koch, accusing them of being against key components of his populist agenda and suggesting they're irrelevant in today's Republican Party.

Trump's public attack, following a weekend in which he was criticized at a Koch network summer meeting, comes amid speculation that the Koch brothers are reconsidering their typically full-throated support for Republican candidates during the midterm elections.

"The globalist Koch Brothers, who have become a total joke in real Republican circles, are against Strong Borders and Powerful Trade. I never sought their support because I don't need their money or bad ideas," Trump tweeted Tuesday morning. "They love my Tax & Regulation Cuts, Judicial picks & more."

The globalist Koch Brothers, who have become a total joke in real Republican circles, are against Strong Borders and Powerful Trade. I never sought their support because I don't need their money or bad ideas. They love my Tax & Regulation Cuts, Judicial picks & more. I made..... — Donald J. Trump (@realDonaldTrump) July 31, 2018

In a separate tweet, Trump argued that he "made them richer" and that the Koch network "is highly overrated."

"I have beaten them at every turn," Trump wrote of the Kochs. They want to protect their companies outside the U.S. from being taxed, I'm for America First & the American Worker - a puppet for no one. Two nice guys with bad ideas. Make America Great Again!"

....them richer. Their network is highly overrated, I have beaten them at every turn. They want to protect their companies outside the U.S. from being taxed, I'm for America First & the American Worker - a puppet for no one. Two nice guys with bad ideas. Make America Great Again! — Donald J. Trump (@realDonaldTrump) July 31, 2018

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