As the incoming class of 2018 make their way to Capitol Hill, the first order of business will be a vote on a package of rules to govern the 116th Congress. Already, some of the party’s more progressive upstarts have registered their displeasure.

Pelosi’s rule package includes a provision known as “Pay As You Go,” or PAYGO. This measure would require any new government spending to be offset by cuts elsewhere, or increases in revenue through tax hikes. Tweeting on Wednesday night, incoming Representative Alexandria Ocasio-Cortez (D-New York) and Rep. Ro Khanna (D-California) said that they would vote against Pelosi’s rules package as long as PAYGO was included.

“PAYGO isn’t only bad economics,” Cortez wrote, “it’s also a dark political maneuver designed to hamstring progress on healthcare” and other legislation. A self-described ‘Democratic Socialist,’ Cortez favors bold measures like universal healthcare and a $15 federal minimum wage, both of which would call for massive hikes in government spending to implement.

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Since her shock victory over ten-term incumbent Rep. Joe Crowley in New York’s Democratic primary last June, Cortez has become a poster child for the new, more unapologetically left-wing branch of the Democratic Party. Her victory and the media hubbub surrounding it prompted Democratic National Committee Chairman Tom Perez to declare her the “future of our party” in July.

While Cortez and Khanna plan on voting no, the Democratic old guard still reigns supreme, from a numbers perspective at least. To block Pelosi’s rules package, 18 Democrats will need to vote against it – 19 if Rep. Tom Reed (R-New York) votes with Pelosi, as he has said he would.

Spending is just one bone of contention between Pelosi and the progressives that has emerged since November’s midterm elections.

Cortez has been one of the loudest voices campaigning for action on climate change since the midterms, joining environmental activists from Sunrise for a sit-in protest outside Pelosi’s office a week after the elections. The New York congresswoman is also a vocal proponent of a ‘Green New Deal,’ an ambitious plan to end America’s dependency on fossil fuels and move the country’s electrical grid to 100 percent renewable energy by 2030.

According to the text of the plan itself, the deal would go far beyond any environmental legislation ever enacted in the US, and would also include measures to implement, “social, economic, racial, regional and gender-based justice.”

The plan also calls for government intervention in upgrading “every residential and industrial building” in the country, regulating the vehicles Americans drive, and ensuring money is transferred to “frontline” and “marginalized” communities affected by climate change. The deal is backed by 40 Democrats, but is still a long way off from being realized.