The committee went after Sens. Bill NelsonClarence (Bill) William NelsonReport: FCC chair to push for complete repeal of net neutrality Collins: Pass bipartisan ObamaCare bills before mandate repeal Democrats scramble to contain Franken fallout  MORE (Fla.), Ben Nelson (Neb.), Claire McCaskillClaire Conner McCaskillOn Capitol Hill, few name names on sexual harassment Democrats scramble to contain Franken fallout  Gillibrand to donate money from Franken's PAC MORE (Mo.), Sherrod BrownSherrod Campbell BrownScott Garrett poses real threat to EXIM Bank, small businesses Class warfare fight erupts over tax bills Senators Hatch, Brown have heated exchange on GOP tax plan MORE (Ohio), Debbie StabenowDeborah (Debbie) Ann StabenowRep. Upton won't seek Michigan Senate seat, focuses on reelection The feds need to return to the original intent of foreign investment review GOP campaign committees call on Democrats to return Franken donations MORE (Mich.), Joe ManchinJoseph (Joe) ManchinDemocrats scramble to contain Franken fallout  Overnight Finance: House passes sweeping tax bill in huge victory for GOP | Senate confirms banking regulator | Mulvaney eyed for interim head of consumer agency Overnight Regulation: Senators unveil bipartisan gun background check bill | FCC rolls back media regs | Family leave credit added to tax bill | Senate confirms banking watchdog MORE (W.Va.), Tester and Casey in news releases Monday. 

Ben Nelson, a top GOP target in 2012, expressed some disappointment Monday with the president's plan. In a statement, Nelson said the budget proposal "starts the debate about getting spending under control in Washington," but lamented that some of the largest reductions in the plan Obama said would reduce the deficit by $1 trillion over the next decade "arrive in the later years."  

Nelson said he intends to work with senators to "enact spending cuts that kick in sooner," but he didn't offer any detail on specific cuts.

Bill Nelson praised the budget proposal Monday, blasting critics whom he said "offer no real solution and really haven't done any cutting themselves."

"At least the president's budget is a step in the right direction in trying to get this country turned around, to really do something about lowering the deficit and cutting all of this wasteful spending," Nelson told the Bradenton Herald

Brown pointed the finger at Republicans, calling the proposal an effort to "clean up after years of reckless decisions that exacerbated our budget crisis," mentioning the Bush-era tax cuts and wars in Iraq and Afghanistan. 

"By not turing our backs on priorities that promote America's competitiveness — like education, innovation, infrastructure and energy — the proposal is forward-looking and responsible," said Brown.  

No reaction yet to the president's plan from McCaskill or Manchin, both top 2012 targets.  

McCaskill has been championing a plan, along with Sen. Bob CorkerRobert (Bob) Phillips CorkerBannon: McConnell 'picking up his game' because of our 'insurgent movement' State Dept. spokeswoman acknowledges 'morale issue' The Hill's 12:30 Report MORE (R-Tenn.), to enact a federal spending cap that she says will cut some $8 trillion from the deficit over the next decade.