An Illinois Republican on Monday said Sen. Scott Brown (R-Mass.) should be "ashamed of himself" for opposing Rep. Paul RyanPaul RyanPoll: Trump voters have positive opinion of president Overnight Regulation: Senators call for 'cost-effective' regs | FCC chief unveils plans to roll back net neutrality Overnight Tech: FCC chief unveils plan for net neutrality rollback | Tech on Trump's sweeping tax plan | Cruz looks to boost space industry MORE's (R-Wis.) budget plan.

"Respectfully, Scott Brown ought to be ashamed of himself," Rep. Joe Walsh (R-Ill.) told Neil Cavuto on the Fox Business Network. "This is the defining moment of this generation. We have got to be bold. We know these entitlements have to be reformed to be saved. He knows that."

Walsh added that any Republican opposed to the plan was motivated by "political reasons."

"Any Republican that doesn’t vote for this or doesn’t support this is purely being guided by political reasons," Walsh continued. "This is not time to be politically scared. Every day I am in this town I am more convinced this president has no clue as to the financial cliff we are about to fall off of.”

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Walsh's comments come the same day that Brown, a centrist, penned an op-ed in Politico explaining why he won't vote for Ryan's plan.

"While I applaud Ryan for getting the conversation started, I cannot support his specific plan — and therefore will vote 'no' on his budget," Brown wrote in the op-ed.

Last month another centrist Republican, Sen. Susan CollinsSusan CollinsOvernight Energy: Lawmakers work toward deal on miners’ benefits Schumer: Senate Russia probe moving too slowly Collins: I'm not working with Freedom Caucus chairman on healthcare MORE (Maine), announced she too would not vote for the plan.

Senate Majority Leader Harry ReidHarry ReidDraft House bill ignites new Yucca Mountain fight Week ahead: House to revive Yucca Mountain fight Warren builds her brand with 2020 down the road MORE (D-Nev.) is expected to hold a vote on the Ryan budget soon, perhaps as early as this week. Senate Democrats have charged that the Ryan plan is too extreme, particularly for its proposal to turn Medicare into a voucher system for Americans under 55.