Retiring Rep. Ryan Costello Ryan Anthony CostellloTrump struggles to stay on script, frustrating GOP again Bottom line Former GOP Rep. Costello launches lobbying shop MORE (R-Pa.) said Tuesday he believes adult film star Stormy Daniels's allegations that she had an extramarital affair with President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

“I think she is,” Costello replied after MSNBC’s Katy Tur asked if he believed Daniels, whose real name is Stephanie Clifford, is telling the truth.

The GOP lawmaker said that constituents will often bring up the allegations against Trump during town halls, but that his responses to their questions create divisive reactions.

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“From the left it’s never good enough. And from the right the moment that you say anything often the response is, ‘Why are you out there saying that about the president? Why aren’t you defending him?’” Costello said.

The Pennsylvania Republican announced Sunday that he would not seek reelection, citing the "very angry" political environment as a factor in his decision.

“Whether it’s [Trump’s alleged affair with] Stormy Daniels, or passing an omnibus spending bill that the president threatens to veto after promising to sign, it’s very difficult to move forward in a constructive way today,” Costello told the Daily Local News.

A redrawn state district map also led to his decision not to run. The Cook Political Report shifted the Republican’s district from “toss up” to “likely Dem.”

Daniels publicly revealed more details of her alleged affair with Trump during an extensive interview with "60 Minutes" that aired Sunday evening.

It was her first on-camera interview since questions began swirling this year over a $130,000 payment Daniels accepted from Trump's personal lawyer days before the 2016 election, a payment she says was aimed at keeping her silent.

Daniels claimed in the interview that she had consensual sex with Trump in 2006, a year after he married first lady Melania Trump Melania TrumpMelania Trump: Ginsburg's 'spirit will live on in all she has inspired' The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now Warning label added to Trump tweet over potential mail-in voting disinformation MORE, and that she was threatened years later by an unknown man to stay quiet about the alleged affair.

Costello said Tuesday that fiery responses from constituents that he experienced illustrated the "Catch-22 type of conundrum" facing Republicans in suburban districts.

“And I’m not here to complain about that, but obviously, when I get asked about it, I’m certainly comfortable diagnosing it because I’ve lived through it for the last year and a half,” he said.