President Trump urged lawmakers to pass his megabill in a new social media post on Wednesday morning, saying that because of "GROWTH," it will be "one of the most successful pieces of legislation ever passed."

"THIS GROWTH has already begun at levels never seen before," Trump said in the post on his conservative social media platform, Truth Social.

Trump also touted his tariff policy and said that the U.S. "will make a fortune this year, more than any of our competitors, but only if the Big, Beautiful Bill is PASSED!"

"Republicans, don’t let the Radical Left Democrats push you around. We’ve got all the cards, and we are going to use them," Trump added in the post.

The House Rules Committee voted 7-6 to advance President Donald Trump's megabill early on Wednesday, sending the legislation to the floor for consideration.

Republican Reps. Ralph Norman and Chip Roy sided with Democrats in voting against the measure in committee, the body having met for nearly 12 hours.

The House will next debate the measure with the hopes of holding a vote by Independence Day.

The lower chamber will convene for legislative business at 9 a.m. Wednesday, with debate followed by floor action, first on the rule vote.

Several hardliners are expected to vote against the procedural motion to advance the legislation, which could potentially put the House at a standstill.

-ABC News' Lauren Peller and Alex Ederson

Twenty states have filed a lawsuit challenging what they said was the Department of Health and Human Services' "decision to provide unfettered access to individual personal health data" to the Department of Homeland Security and, by extension, Immigration and Customs Enforcement.

California Attorney General Rob Bonta alleged in a statement published Tuesday that President Donald Trump's administration had violated federal privacy laws -- including the Health Insurance Portability and Accountability Act -- by releasing the data.

"Attorney General Bonta and the coalition argue that the mass transfer of this data violates the law and ask the court to block any new transfer or use of this data for immigration enforcement purposes," the statement said.

"The Trump administration has upended longstanding privacy protections with its decision to illegally share sensitive, personal health data with ICE," Bonta said.

"In doing so, it has created a culture of fear that will lead to fewer people seeking vital emergency medical care," Bonta continued.

"I'm sickened by this latest salvo in the president's anti-immigrant campaign. We're headed to court to prevent any further sharing of Medicaid data -- and to ensure any of the data that's already been shared is not used for immigration enforcement purposes," he added.

-ABC News' Michael O'Keefe

Speaker Mike Johnson said Tuesday he is unsure if the House will have full attendance on Wednesday -- the earliest day the chamber would vote on the Trump policy bill -- due to the weather and members’ flights being canceled.

“We’re monitoring the weather closely,” he said. “We have to figure that out.”

Johnson said there are “a lot of delays” in lawmakers returning, adding, “so that’s part of the problem.”

The speaker needs all the votes he can get considering his razor-thin majority, so attendance issues could play a huge role in getting the bill across the finish line. The House is slated to convene Wednesday morning at 9 a.m for legislative business. Consideration of HR 1 will then occur, but there are several procedural hurdles Republicans must overcome to vote on final passage.

Ground stops and ground delays were in place Tuesday evening from Charlotte to Boston and in Las Vegas and Denver because of storms. As of 6 p.m. ET, 1,257 flights have been cancelled nationwide. Washington’s Reagan National, New York’s LaGuardia and DCA, LGA and Newark Liberty were the hardest hit.

-ABC News’ Lauren Peller and Sam Sweeney