Barring a last-minute apology to Congress, Republican Rep. Joe Wilson of South Carolina faces what is likely to be a partisan vote scolding him for shouting "You lie!" at President Barack Obama.

Democratic aides said House leaders were preparing to introduce a resolution of disapproval Tuesday afternoon, with a vote likely later in the day.

Democrats confirmed Monday night that they were moving forward with the rebuke.

Wilson has apologized to the White House for his outburst last week during Obama's speech to Congress. But Democrats say Wilson also should apologize to Congress for what they call an unprecedented breach of decorum.

Wilson has refused to do so, saying his initial apology was sufficient.