Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) is reportedly urging members of her caucus to focus on their constitutional duties, and not President Trump, as the House moves forward with an impeachment inquiry.

Pelosi and top House Democrats doubled down on that focus during a private conference call with members Sunday afternoon, emphasizing the need to put congressional responsibility ahead of politics.

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“I’m in Texas and they have a saying here: ‘Don’t Mess with Texas.’ Well, I say, ‘Don’t Mess with the Constitution, Mr. President,’ ” Pelosi said, according to an aide on the call.

The aide said the Speaker told members the inquiry “isn’t about politics” or partisanship — “It’s about patriotism,” she said.

“The idea that this has anything to do with whether you like him or not — forget that. That’s about the election. This is about the Constitution,” Pelosi said, according to an aide.

The call was first reported by Politico.

The news outlet reports that Rep. Cheri Bustos Cheryl (Cheri) Lea BustosThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally DCCC dropping million on voter education program Clark rolls out endorsements in assistant Speaker race MORE (D-Ill.), head of the Democratic Congressional Campaign Committee (DCCC), told vulnerable members to test their message in polling across their districts.

The aide on the call said the Speaker also reiterated that the “polls have changed drastically about this.”

House Democratic Caucus Chairman Hakeem Jeffries Hakeem Sekou JeffriesDemocratic leaders: Supreme Court fight is about ObamaCare Pelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts MORE (N.Y.) also reportedly outlined a plan for members to use “repetition” with six words: “betrayal, abuse of power, national security."

“If we stick to the Speaker’s plan, we will prevail,” House Judiciary Committee Chairman 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.) added, according to Politico.

A spokesperson for Pelosi’s office was not immediately available for comment regarding the reported conference call.

Bustos also reportedly cited the DCCC’s first poll on impeachment since Pelosi launched a formal inquiry last week. Politico reports the poll found 54 percent of likely voters support the inquiry.

Other polls showed an increase in public support for impeachment since the formal inquiry was launched amid new allegations that Trump encouraged Ukraine's president to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son. Trump has continued to defend his call with the Ukrainian leader, saying it was appropriate.

A CBS News survey conducted by YouGov released Sunday showed that 55 percent of Americans support an impeachment inquiry.

A Hill-HarrisX survey on Friday found support for impeachment proceedings rose to 47 percent, a 12-point increase compared to a poll conducted three months ago.

Almost all House Democrats have backed the impeachment inquiry.

Speaking at the Texas Tribune Festival on Saturday, Pelosi similarly brushed off concerns over political ramifications.

"It doesn’t matter," Pelosi said, referring to the possibility of losing control of the House in 2020. “Our first responsibility is to protect and defend the Constitution of the United States."

Updated at 8:27 a.m.