"I looked at the president’s proposed budget, the projected deficits, the accumulated debt over the next decade — and wondered: what are we doing?" said Manchin. 

So far most Senate Democrats have refrained from even mentioning the budget, which Senate Majority Leader Harry ReidHarry Mason ReidMcConnell not yet ready to change rules for Trump nominees The Hill's Morning Report — Sponsored by CVS Health — Trump’s love-hate relationship with the Senate Trump to press GOP on changing Senate rules MORE (D-Nev.) indicated he would not call up for a vote. Only Assistant Senate Majority Leader Dick DurbinRichard (Dick) Joseph DurbinThis week: House GOP regroups after farm bill failure Overnight Health Care — Sponsored by PCMA — Trump hits federally funded clinics with new abortion restrictions Dem lawmaker spars with own party over prison reform MORE (D-Ill.) offered guarded support on Tuesday, saying it offered "fiscal responsibility on one side and economic growth on the other."

Republicans, in the meantime, have burned hours of floor time trying to lampoon it and suggesting that if it were called up for a vote it would likely face the same fate as last year’s budget, which was killed 97-0. 

Manchin went on to argue the proposal was deceptive in its claim to balance the budget.

"There is not a single year that this budget is balanced," he said. "At the end of a decade, this budget puts us an additional $6.7 trillion in debt. How does that make sense?"

Manchin, a centrist, went on to cover his flank, however, affirming he was a "proud Democrat" and characterizing his critique as “respectful as possible.” 

“I can already hear some folks say: ‘Oh, there goes Joe ManchinJoseph (Joe) ManchinBlankenship third-party bid worries Senate GOP Overnight Energy: Feds eye rolling back Alaska wildlife rule | Park service releases climate report | Paper mills blamed for water contamination | Blankenship plans third-party Senate run The Hill's 12:30 Report — Sponsored by Delta Air Lines — Frenzy over Kennedy retirement rumors | Trump challenges DOJ MORE again, blaming President Obama …' but what we’re doing just doesn’t make any sense to me, and I certainly can’t in good conscience try to tell the people of West Virginia any different,” he said. 

“If and when the president’s budget proposal comes up for a vote, I will not support it,” he concluded.