Sen. Tom Cotton (R-AR) on Thursday warned House Republicans that their bill to replace ObamaCare won't pass in the Republican-controlled Senate in its current state.

Cotton tweeted that the bill needs "major changes," and he cautioned Republicans against acting "like Dems" by voting before a budget estimate is completed.

"What matters in long run is better, more affordable health care for Americans, NOT House leaders' arbitrary legislative calendar," Cotton added.

The Arkansas senator joins a growing number of Republican and Democratic lawmakers who have come out against the GOP's American Health Care Act.

Critics have said the bill amounts to "ObamaCare Lite."

Rep. Thomas Massie (R-KY) even said on "America's News Headquarters" that it is a "stinking pile of garbage."

At a press briefing, White House Press Secretary Sean Spicer was asked about Cotton's tweets by Fox News' John Roberts.

Spicer stressed the importance of repealing and replacing ObamaCare, which he called a "monstrosity."

He said that the Trump administration with continue to engage with members of Congress - Cotton included - to hear as many ideas and concerns about the health care law as possible.

"When the House passes it and it goes over to the Senate, I'm sure Sen. Cotton and other senators will have an opportunity to have their say," Spicer said. "That's part of the process. We welcome his ideas and his thoughts, as we do with other senators."

"We're going to get this thing passed with all of their input and ideas."

Let us know what you think in the comments, and watch Cotton and Bill O'Reilly discuss President Trump's wiretapping allegations.

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