U.S. Sen. Joni Ernst's vote for President Donald Trump's "big, beautiful bill" could be a defining issue in her reelection race.

The president insisted that Medicaid was sacrosanct—only to be told that his megabill chops the program by $1 trillion.

The House voted overnight Thursday, after hours of delay, to advance President Trump's "big, beautiful bill" before a final vote, which is expected soon.