They also are insisting that Republicans return to “regular order” and not attempt to push a tax bill through Congress using budget reconciliation rules that require only a simple majority in the Senate.
Finally, they want a rewrite of the tax code that does not add to the deficit and that is not paid for with cuts to programs such as Medicare, Medicaid and Social Security.
Analyses of Republican tax plans have found that the changes that they have proposed would disproportionately benefit the rich. Thus far, Republicans remain committed to using reconciliation in hopes of getting legislation to Mr. Trump’s desk before the end of the year.
As Republicans stumble with their legislative agenda, Democrats have been working to revamp theirs ahead of the 2018 midterm elections.
Last week, congressional Democrats unveiled an economic program called “A better deal” in hopes of stealing some of Mr. Trump’s populist luster. The plan included raising the minimum wage and lowering drug prices.
On taxes, Democrats tend to favor raising taxes on the rich to pay for cuts to lower tax rates on middle-income families. The parties are in closer agreement on changes to the corporate tax system, but Democrats argue that the cuts that Republicans are proposing are far too deep.
Republicans have said that they are open to a bipartisan tax plan, but most of their discussions on changes to the code have been among themselves.
With the failure of their health care effort still fresh, the Republicans could soon change that.
At a gathering Monday of conservative activists sponsored by Americans for Prosperity, the Koch brothers’ political network, Marc Short, the White House legislative affairs director, made the case that Democrats need to be brought into the fold. The Republican majority in the Senate, he said, was too slim for party members to count only on one another.
“We ask your help actually reaching out to Democrats as well,” Mr. Short said, noting the ones who are coming up for election. “If they hear from their constituents that they need tax reform, that’s going to be a very strong selling point.”
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