Republican Sen. Ron Johnson on Wednesday blasted President Donald Trump 's " one big, beautiful bill " as "immoral" and "grotesque," and reiterated that he will vote against it unless his GOP colleagues make major changes.

"This is immoral, what us old farts doing to our young people," Johnson said on CNBC's " Squawk Box " after sounding alarms that the massive tax-and-spending-cut bill would add trillions of dollars to national deficits.

"This is grotesque, what we're doing," Johnson said. "We need to own up to that. This is our moment."

"I can't accept the scenario, I can't accept it, so I won't vote for it, unless we are serious about fixing it," he continued.

Johnson has been among the Senate's loudest GOP critics of the budget bill that narrowly passed the House last m

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