U.S. President Donald Trump lashed out at congressional Republicans on Thursday for failing to swiftly pass his signature legislation, warning them on social media they would lose MAGA votes if the bill died.

House Republican leaders struggled to find the final votes to advance Donald Trump’s massive tax and spending package, holding key votes open for hours as the president and his allies worked to win them over.

By Wednesday evening, enough Republicans remained opposed to the Senate’s version of the bill to effectively stall its passage in the House.