An Illinois Republican on Monday said Sen. Scott Brown (R-Mass.) should be "ashamed of himself" for opposing Rep. Paul RyanPaul RyanOvernight Finance: Democrats roll out 'Better Deal,' new economic agenda | Regulators to mull future of 'Volcker Rule' | Gingrich, small biz to launch major tax cut campaign California Democrat seeks to win fight on war powers Speaker Ryan: Mueller is 'anything but' a Dem partisan 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 CollinsGOP lawmaker suggests duel with female senators This week: ObamaCare repeal vote looms over Senate Week ahead: Uncertainty surrounds ObamaCare repeal vote MORE (Maine), announced she too would not vote for the plan.

Senate Majority Leader Harry ReidHarry ReidConservative Senate candidate calls on GOP to end filibuster Ex-Reid aide: McConnell's 'original sin' was casting ObamaCare as 'partisan, socialist takeover' GOP faces growing demographic nightmare in West 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.