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.
Despite sweeping Democratic successes in the past two national elections, continuing job losses and President Barack Obama's slipping support could lead to double-digit losses for the party in next year's congressional races and may even threaten their House control.
Fifty-four new Democrats were swept into the House in 2006 and 2008, helping the party claim a decisive majority as voters soured on a Republican president and embraced Obama's message of hope and change. Many of the new Democrats are in districts carried by Republican John McCain in last year's presidential contest; others are in traditional swing districts that have proved tough for either party to hold.
A powerful senator warned against sending more American troops to Afghanistan, signaling growing skepticism over the war within President Barack Obama's own party.
Carl Levin, the influential chairman of the Senate Armed Services Committee, was the latest top Democrat in Congress to voice opposition to a fresh military build-up in Afghanistan, as the White House weighs deploying yet more troop combat troops.
But his comments came as the Pentagon confirmed it intended to send more troops to Afghanistan to tackle a growing threat from improvised explosive devices.
Levin called for redoubling efforts to bolster Afghan security forces before any further expansion in US troops, which are set to reach 68,000 by the end of the year.
The fierce national debate over health care is entering a new phase, with advocates on all sides focused on a handful of legislative bottlenecks that will determine the ultimate overhaul of the $2.5 trillion medical care system.
President Barack Obama's prime-time address to Congress on Wednesday reassured some nervous Democratic lawmakers, and he aligned himself more closely with certain proposals. While Obama's words seemed to halt and possibly reverse the momentum that conservative groups had gained in August, they did not resolve all the concerns of centrist Democrats who will play pivotal roles, especially in the Senate.
Democratic leaders are planning a House vote early next week to admonish Republican Rep. Joe Wilson if he does not apologize on the House floor for yelling "You lie!" during President Barack Obama's health care address to Congress.
National attention from the heckling episode has money pouring into Wilson's campaign treasury and that of his 2010 Democratic challenger. Wilson had raised more than $700,000 since the incident as of Friday, according to the National Republican Congressional Committee. His opponent, Rob Miller, had received more than $1 million from 25,000 donors nationwide, said his campaign manager, Lindsay Zoeller.
Democrats and Republicans alike are denouncing Rep. Joe Wilson for shouting "You lie" at President Barack Obama during his speech to Congress, an extraordinary breach of decorum for which the South Carolina Republican swiftly apologized.
"There'll be time enough to consider whether or not we ought to make it clear that that action is unacceptable in the House of Representatives," House Majority Leader Steny Hoyer, D-Md., said late Wednesday on WTOP radio when asked about possible punishment for Wilson. "I've talked to Republican members who share that view."
The top Democrat in the House of Representatives insisted Tuesday that a government-run insurance option was "essential" to passing President Barack Obama's health reform plan.
House Speaker Nancy Pelosi's comments followed growing suggestions that the so-called "public option" could be jettisoned or delayed in a final compromise intended to secure Obama's top legislative priority.
"I believe that a public option will be essential to our passing a bill in the House of Representatives," Pelosi said after meeting Obama and Vice President Joe Biden at the White House.
Democrats remain sharply divided over what to do about the nation's health care system and return to Congress this week without any clear plan or consensus on reform.
After a month of rowdy town meetings, the picture for health care reform remains as muddled as ever on Capitol Hill and few believe President Barack Obama's attempt to rally support with a speech to a joint session of Congress Wednesday night will improve the situation.
"You're looking at one screwed-up mess," a long time Democratic operative told Capitol Hill Blue over the weekend. "Democrats lack focus on the issue."
Yes, we got trouble right here in Potomac River City.
That starts with "T" and that rhymes with "D" and that stands for "Democrats."
As President Barack Obama's once seemingly-unassailable popularity wanes and public anger grows over the failing economy and issues like health care "reform," the party of the jackass sees trouble with voters on the horizon.
Democrats aren't paranoid. Voters are out to get them. The same voters who threw the bums out in 2006 and 2008 now consider Obamacons the bums and they want change.
Libertarian Texas Congressman Ron Paul is finding rare support for his push to shine the spotlight on the Federal Reserve.
"He's finally found the right moment," Sarah Binder of the liberal Brookings Institution told Reuters.
"His bill happens to be in the right place at the right time," adds Paul spokesman Rachel Mills.