As the Senate moved closer to finalizing President Donald Trump’s “One Big Beautiful Bill,” the president took to social media early Tuesday to warn that failure to reach an agreement would result in the largest tax increase in history.

His message came amid a marathon “vote-a-rama,” where lawmakers from both parties spent hours submitting amendments to the massive bill, Fox News reported.

“Republicans, the One Big Beautiful Bill, perhaps the greatest and most important of its kind in history, gives the largest Tax Cuts and Border Security ever, Jobs by the Millions, Military/Vets increases, and so much more. The failure to pass means a whopping 68% Tax increase, the largest in history!!!,” he posted.

There is currently no clear end in sight as Republican leaders work to secure enough support for the bill while battling Democratic amendments aimed at blocking it.

With a slim majority, GOP leaders cannot afford to lose more than three Republican votes. Two senators—Thom Tillis of North Carolina and Rand Paul of Kentucky—have already signaled their opposition.

Tillis announced that he would not seek reelection following Trump’s threats to support a primary challenger against him this week.