More cracks are appearing in Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE’s (D-Calif.) dam against impeachment.

Rep. Katie Porter (Calif.) on Monday became the second Democrat representing a swing district to back the opening of an inquiry.

Porter joined a presidential hopeful and a leading member of the party’s whip team in advocating for impeachment, raising the pressure on Pelosi to contain the tide.

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The Speaker and her top lieutenants have been largely successful in doing so. They’ve warned that such a divisive step could stir a backlash if Democrats don’t first rally more public support behind impeachment.

Their challenge, time and time again, has been Trump and his penchant for provocation.

The latest Democrats to back impeachment did so after Trump said he would accept dirt on his political foes from hostile foreign countries.

“It's been a slow increase but nonetheless an increase,” Rep. Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-(Calif.), chairman of the House Intelligence Committee, told CNN Tuesday. “Every member has to make an individual determination about what they think is right for the country.”



All told, more than 60 Democrats — roughly a quarter of the caucus — have endorsed the impeachment push, according to a tally kept by The Hill. Most of those are liberals from safely blue districts, but their ranks now also include Porter, a freshman who won a razor-thin race in a district long held by Republicans.

“When faced with a crisis of this magnitude, I cannot with a clean conscience ignore my duty to defend the Constitution,” she said in a video explaining her decision. “I can’t claim to be committed to rooting out corruption and putting people over politics and then not apply those same principles and standards in all of the work I do.”

Porter joined Rep. Tom Malinowski Thomas (Tom) MalinowskiDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program The Hill's Morning Report - Presented by Facebook - First lady casts Trump as fighter for the 'forgotten' Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks MORE (N.J.), the other freshman Democrat from a swing district to endorse the impeachment effort. Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE won Porter’s district by five points and she also won Malinowski’s district by one point.

The pair are outliers among the so-called red-to-blue freshmen, a group of more than 40 Democrats who flipped Republican-held seats in the 2018 midterms, lending Democrats their House majority in the process. It’s that group that Pelosi has in mind to protect as she discourages impeachment talk in favor of methodical investigations.

It’s a task that's become more onerous with each new Trump controversy.

After the president’s remarks about accepting foreign dirt on an election opponent, Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.), a Pelosi ally who's running for president, quickly endorsed impeachment.

Rep. Dan Kildee Daniel (Dan) Timothy KildeeLawmakers fear voter backlash over failure to reach COVID-19 relief deal Democrats set to hold out for big police reform More than 100 Democrats press Trump to extend jobless benefits MORE (D-Mich.), a chief deputy whip, piled on a day later, saying the president's comments were “absolutely chilling.”

Rep. Carolyn Maloney Carolyn Bosher MaloneyPelosi, Democrats unveil bills to rein in alleged White House abuses of power Government watchdog recommends creation of White House cyber director position Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), a 14-term lawmaker, joined the brigade over the weekend. She cited “numerous violations of public trust and democratic norms” in arriving at the “inescapable conclusion” that Democrats should begin the impeachment process immediately.



“He continues to put himself above the law and his own interests over the American people and our democracy,” she said.

Pelosi has been remarkably consistent. She and the top members of her leadership team were all on Capitol Hill in 1998 when Republicans suffered the political fallout after impeaching President Clinton without first building bipartisan support, and don’t want to make the same mistake.



Asked last week whether she would launch the process if more than half of her 235-member caucus endorsed it, Pelosi dismissed the idea as unrealistic.



“It's not even close in our caucus,” Pelosi told CNN.



Pelosi instead has pressed forward with vigorous investigations into Trump's policies and conduct while in office, including his actions surrounding Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's probe into Russia's election interference and whether the president attempted to obstruct the probe.



Democratic leaders have also issued a series of subpoenas to compel the administration to release disputed documents and witness testimony. And last week, the House adopted a resolution granting Democratic committee heads new legal powers to pursue those subpoenas before the courts.



Those supporting that more cautious approach say it's not only less divisive, but might prove more effective.



“There's a perception that if we announce an impeachment inquiry tomorrow, things change dramatically. That suddenly witnesses like [former White House counsel] Don McGahn who have been resisting coming in are going to show up and say 'OK, where do I testify'? The Justice Department's going to open its files,” Schiff said Tuesday. “None of that is going to happen. We are still going to have to go to court.



“If anything, the administration will dig in deeper because now we have gone to sort of DEFCON 5.”



Yet those clamoring for impeachment increasingly see it not only as a way to confront a president facing numerous allegations of criminal wrongdoing, but also as part of their constitutional duty to be a check on the executive branch.



“Obviously, the ultimate action that Congress can take for a president who doesn't just speak about engaging in misconduct — who actually does commit high crimes and misdemeanors — is an impeachment proceeding,” said Rep. David Cicilline David Nicola CicillineClark rolls out endorsements in assistant Speaker race Races heat up for House leadership posts The folly of Cicilline's 'Glass-Steagall for Tech' MORE (D-R.I.).

This story was updated at 7:29 p.m.