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 Thursday that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE “fell in line” on his border wall demands after listening to Sean Hannity and other conservative commentators blast a lack of funding for his proposed border wall.

Costello, who will be exiting Congress next month after opting not to run for reelection after redistricting in his state, called the partial government shutdown “foreseeable” during an appearance on MSNBC, noting a stalemate between Republicans and Democrats over the border wall funding.

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“The Senate voted 100-0 to pass a clean CR [continuing resolution] and sent it to the House,” Costello said, referring to the Senate passing a stopgap measure by voice vote last week that did not include border wall funding.

“Sean Hannity and a few other people screamed fire. The president then fell in line behind Sean Hannity," Costello added.

The Pennsylvania Republican, who has been increasingly outspoken about Trump, noted that he joined other House Republicans in voting for a bill that added $5 billion in border wall funding demanded by Trump.

Senate Republicans expressed disbelief last week after Trump changed course and returned to demanding the border wall money at the urging of House Republicans. The White House had previously signaled that Trump would signed the Senate-passed measure.

“We in the House voted, and I voted for it, for an additional $5 billion and about $8 billion in disaster relief on top of the clean CR. Democrats were not willing to go along because they didn’t want any more wall funding in there,” Costello said Thursday.

Large swaths of the federal government – about 25 percent – shut down starting on Saturday after lawmakers failed to reach a funding deal amid differences over Trump's border wall demand. Costello predicted the government would remain closed until the new Congress is sworn in Jan. 3.

Costello said Trump hurt himself when he tried personally negotiating with House Democratic Leader 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 (Calif.) and Senate Democratic Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (N.Y.) in front of cameras in the Oval Office earlier this month. During the meeting, Trump vowed to hold the "mantle" of a shutdown.

“Listen, rule number one in negotiation is don’t negotiate against yourself,” Costello said. “The president had Nancy and Chuck in the Oval Office and he negotiated against himself, and now he’s in a corner, and I’m not sure how he backs himself out of that corner.”

Costello said in May he would not seek reelection, citing the “very angry” political environment as one of the many reasons for his decision.