Senate Democrats on Tuesday unveiled a plan to let Americans contribute a greater amount of untaxed income to 401(k) retirement accounts — a clear response to Republicans considering more stringent limitations as part of their tax overhaul.

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Currently, people under 50 can contribute up to $18,000 a year in pre-tax dollars into 401(k) retirement accounts through their employers. Republicans had reportedly discussed lowering that amount to $2,400, though backtracked somewhat after President Trump tweeted that no changes were coming.

Still, GOP congressional tax writers have refused to rule it out as they prepare for the Wednesday unveiling of their tax plan.

Democrats say they would raise the cap to $24,500, as well as provide tax credits to employers that match funds and create a new type of IRA retirement program for those without employer-sponsored plans.

Allowing less pretax dollars into the accounts, Whitehouse said, would only create the appearance of adding more tax revenue, because the Republican plan would mean less tax revenue when people withdraw their retirement funds.

“It does create phantom revenues,” he said.

Republicans are struggling to find $4 trillion in revenue raisers to offset the tax cuts they are proposing. If they do, they will still add up to $1.5 trillion to the deficit, the most allowed by their budgetary framework.