Democratic Rep. Jefferson Van Drew's expected decision to join the GOP over the divisive impeachment issue has roiled New Jersey and Washington and left both parties claiming vindication ahead of Wednesday’s historic House vote to make President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE just the third commander in chief to be impeached.

Republicans quickly pounced, arguing that Van Drew's defection is evidence that Democrats, pressured by “radical” liberal activists, have overreached in taking the drastic step of impeaching Trump over his dealings with Ukraine. They’re warning of a bloodbath at the polls next year for other vulnerable Democrats who decide to back impeachment this week.

Yet Democrats, far from dodging the embarrassing episode, are instead leaning in, noting that the heavy pressure on Van Drew was coming not from conservatives in his swing district but from liberals up in arms that the freshman lawmaker was ready to buck the party and oppose the impeachment articles.

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“What he's reacting to is public polling that shows he can't get renominated,” Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), chairman of the House Judiciary Committee, said in an interview Sunday with ABC's “This Week” program.

Internal polling, shared with The Hill and many other news outlets, showed that because of his anti-impeachment stance, Van Drew was in serious jeopardy of losing his Democratic primary. The poll revealed that just 28 percent of Democratic voters wanted Van Drew renominated to his House seat; 58 percent wanted another Democrat to be nominated.

In deciding to vote against impeachment and switch parties, Van Drew, who huddled with Trump on Friday, appeared to be betting his best shot to continue his congressional career was running in a GOP primary and then a general election in South Jersey as an anti-impeachment Republican, not a pro-impeachment Democrat.

It’s unclear whether the Van Drew episode will factor into the impeachment decision facing the other 30 vulnerable Democrats representing districts Trump won in 2016, most of whom are now being targeted by Republicans with anti-impeachment-based attack ads. More than 40 Democrats still have not announced how they’ll vote for the impeachment articles on Wednesday.

But if Republicans thought it would prompt a wave of defections, just the opposite has happened thus far. On Sunday, freshman Rep. Antonio DelgadoAntonio Ramon DelgadoGOP leader says he doesn't want Chamber's endorsement: 'They have sold out' US Chamber of Commerce set to endorse 23 House freshman Democrats Democrats go big on diversity with new House recruits MORE (D-N.Y.) said he was jumping on the impeachment train, followed on Monday by fellow freshman Reps. Ben McAdams (D-Utah), Joe Cunningham Joseph CunninghamKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House Warning signs flash for Lindsey Graham in South Carolina Trump asked Chamber of Commerce to reconsider Democratic endorsements: report MORE (D-S.C.), Elissa Slotkin Elissa SlotkinWray: Racially motivated violent extremism makes up most of FBI's domestic terrorism cases Overnight Defense: House chair announces contempt proceeding against Pompeo | Top general says military has no role in election disputes | Appeal court rejects due process rights for Gitmo detainees Top general: Military will play no role in resolving any electoral dispute MORE (D-Mich.) and Abigail Spanberger Abigail Davis SpanbergerCentrist Democrats got their COVID bill, now they want a vote Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Trump asked Chamber of Commerce to reconsider Democratic endorsements: report MORE (D-Va.) as well as Rep. Matt Cartwright Matthew (Matt) Alton CartwrightRaces heat up for House leadership posts Trump Jr. seeks to elect 'new blood' to Republican Party Republicans face worsening outlook in battle for House MORE (D-Pa.), a four-term member of leadership.

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“The evidence for me is clear: The president abused the power of his office by demanding a foreign government perform a personal favor. He obstructed Congress and its constitutional duty of oversight by withholding pertinent documents and central witnesses,” McAdams told Utah reporters without taking any questions. “His actions weakened our country and the checks and balances enshrined in our founding documents.”

So far, only one other Democrat, Rep. Collin Peterson Collin Clark PetersonKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida Peterson faces fight of his career in deep-red Minnesota district MORE (D-Minn.), appears likely to join Van Drew in opposing impeachment. As a 15-term legislator and chairman of the influential Agriculture Committee, Peterson has good name ID in his district, but Trump won it by 30 points in 2016.

Peterson and Van Drew were the only Democrats to vote against a resolution creating the rules underlying the impeachment inquiry.

In an interview with a local radio station, Peterson said that he too had been approached about joining the GOP but had rebuffed those offers.

“I'm staying in the party, in spite of some of the stuff that's going on that I don't agree with. I am not going switch parties at this stage of my career,” Peterson, 75, told KFGO on Monday. “There have been overtures by the highest levels of the Republican Party in the last couple weeks to ask if I would consider it, and I told them no.”

In the Garden State, top Democrats slammed Van Drew’s party switch, which quickly prompted six of his senior staffers to resign in protest.

Sen. Cory Booker Cory Anthony BookerSunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election The movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump MORE (D-N.J.), whom Van Drew had endorsed for president, called on his supporters to donate money to oust Van Drew from office. New Jersey Gov. Phil Murphy (D) called it a “cynical and desperate” ploy to hang on to power: “Jeff Van Drew Jeff Van DrewThe Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida The Hill's 12:30 Report: First Kennedy to lose a Massachusetts election Ex-Democrat Van Drew speaks at GOP convention MORE has chosen his political career over our Constitution.”

Regardless of what happens to the 16-year state legislator, Republicans have increased their odds of keeping the seat if Van Drew follows through and switches parties. The Cook Political Report on Monday changed the rating of his moderate 2nd Congressional District race from “toss up” to “lean Republican.”

Van Drew will bank on an assist from Trump to win the GOP primary and then will hope Democrats nominate a candidate general election voters deem too liberal for the district. It backed Trump in 2016 after voting for former President Obama in 2008 and 2012. It was previously held by a Republican, former Rep. Frank LoBiondo Frank Alo LoBiondoVan Drew wins GOP primary in New Jersey Amy Kennedy wins NJ primary to face GOP's Van Drew Stimulus price tag of .2T falls way short, some experts say MORE, who served 12 terms before retiring at the end of the last Congress. Democrat Brigid Harrison, a political science professor, officially jumped into the race on Monday, and more challengers are expected.

Rep. Mark Takano Mark Allan TakanoOvernight Defense: Nearly 500 former national security officials formally back Biden | 40 groups call on House panel to investigate Pentagon's use of coronavirus funds Congress missed the point when it came to helping veterans During Suicide Prevention Month, Trump needs to do more for troops' mental health MORE (D-Calif.), who had helped Van Drew’s campaign in 2018, said Democrats were “surprised and upset” upon hearing the news of his defection over the weekend. But he predicted Van Drew will be an anomaly, as Democrats are lining up in support of the articles — even those lawmakers who face dire political risks in doing so.

“I definitely don't see it as a harbinger of things to come,” Takano said Monday. “There are people who are really voting their conscience, and I just think that Jeff has a different value orientation.”