White House legislative affairs director Marc Short on Tuesday emphasized the need for President Trump and Democrats to work together on tax reform, citing Republican lawmakers' past failures to fulfill their campaign promises

“We learned this summer that keeping 50 or 52 Republicans [in the Senate] is not something that’s reliable,” Short said at a roundtable hosted by the Christian Science Monitor. “Despite promises and commitments they’ve made to the American voters since 2010, we don’t feel like we can assume we can get tax reform done strictly on a partisan basis, so it would be wise for us … to try and reach out and earn the support from Democrats as well.”

Trump and other White House officials have expressed frustration with Republican lawmakers, who hold a majority in the House and Senate, following the failure to pass an ObamaCare repeal bill this summer — something the GOP has promised to do for years.

Short expressed confidence that Democrats will get on board, saying the administration has met with 250 members from both sides of the aisle about tax reform since April.

He also said that Trump’s surprise deal with Democratic leaders to raise the debt ceiling and fund the government has reshaped the political dynamics and created “legislative space” to get tax reform done this year.

“The feedback we’ve received from many Democrats is an interest — they recognize corporate rates are too high and they recognize the corporate tax system is unfair and is causing companies to leave our shores, so there’s an opportunity to partner there,” Short said.

Trump will have dinner on Tuesday night with Democratic Sens. Joe Manchin Joseph (Joe) ManchinMomentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' Barrett seen as a front-runner for Trump Supreme Court pick MORE (W.Va.), Hiedi Heitkamp (N.D.) and Joe Donnelly Joseph (Joe) Simon DonnellyMomentum growing among Republicans for Supreme Court vote before Election Day Barrett seen as a front-runner for Trump Supreme Court pick Ex-Sen. Joe Donnelly endorses Biden MORE (Ind.), all of whom face reelection campaigns next year in states that Trump won in last year's presidential election. Several Republicans, including Sens. John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.) and Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (Pa.), will also be on hand.

Short said many of the Democrats he’s talked to agree with the administration on lowering individual rates for low- and middle-income earners but that they’re reluctant to do so for higher earners. Many Democrats, Short said, would like to see tax reform tied to an infrastructure package, although he indicated that’s not something the administration is considering.

A White House proposal on tax reform is expected to come in the next few days.

“This is our window to get this done,” Short said.

The White House also has to worry about getting conservative Republicans on board, including the wildcards in the House Freedom Caucus, many of whom aren’t close with Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE or National Economic Council Director Gary Cohn, former Democrats who are deeply involved with the tax reform process.

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Short said he talks frequently with Freedom Caucus Chairman Mark Meadows (R-N.C.) and characterized the White House’s relationship with the conservatives as better than has been reported.

“We’re pretty well in touch with that caucus and will continue to work with them closely,” Short said. “I don’t think there’s a worry we’re leaving them behind.”

Republicans also still have to pass a budget before moving on to tax reform. Democrats have said they won’t deal if the GOP seeks to pass reform through reconciliation, which bypasses the filibuster's 60-vote threshold.

“We’d love to have a bipartisan fix to get 60 votes,” Short said, although he acknowledged that “reconciliation will be the most likely path.”

And intraparty obstacles remain. Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) has said Trump’s goal of cutting corporate tax rates to 15 percent is unrealistic and that 20 percent would be a better marker.

“It doesn’t help ourselves to negotiate against ourselves,” Short said of Ryan. “We should aim for what we think is best while also understanding there is probably compromise to getting to the best deal, but we think what’s best for the American people is a 15 percent corporate rate right now.”

Still, Short said Ryan and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) have been “terrific allies” on tax reform. He called the GOP leaders “strong partners in helping us advance our economic agenda,” disputing remarks made by former White House chief strategist Stephen Bannon, who said the GOP leaders are trying to “nullify” the 2016 election.

The White House is eager to hang a legislative victory on the board before the end of the year, although Short acknowledged the difficulties inherent in getting Congress to act quickly.

“The legislative process is slow,” he said.