And, in the aftermath of the Parkland shooting, Lamb called for tougher background checks but not stricter gun laws.

Additionally, at a rally on Sunday, United Mine Workers President Cecil Roberts called Lamb a \"God-fearing, union-supporting, gun-owning Democrat.”

The CLF mailer, ironically, highlights that record. The flyer, obtained by ABC News, reads: “THANK YOU CONOR LAMB FOR OPPOSING GUN RESTRICTIONS.”

\"PHOTO:
Jeff Swensen/Getty Images
PHOTO: Rick Saccone waves while President Donald Trump speaks to supporters at the Atlantic Aviation Hanger on March 10, 2018 in Moon Township, Pa.
>

But the recipients were Democrats in Allegheny County, likely in hopes of suppressing turnout among the more liberal Democrats who live in the Pittsburgh suburbs that make up that part of the district; a group of voters that supports more restrictions on guns.

“Our job is to make sure voters in Pennsylvania’s 18th District know where Conor Lamb stands on important issues of the day. This mailer was sent to voters who might find his views on the Second Amendment of note,” said CLF spokeswoman Courtney Alexander in a statement.

Lara Putnam, a professor at the University of Pittsburgh, said that part of the 18th Congressional District is more liberal and more likely to favor gun control.

“If it’s going to the northern part of the district is probably says Conor Lamb supports guns and it’s trying to get the sort of suburban progressive Democrats in the northern part of the district to stay home,” Putnam, who lives just outside the district and has canvassed for Lamb, told ABC News.

But the rest of the district is composed of more rural areas that strongly support gun rights, including parts of Washington, Greene, and Westmoreland Counties.

In addition to the last-minute mailers, Saccone on Monday brought in Donald Trump Jr. to campaign for him. On Saturday Trump was in the district. Lamb spent the weekend highlighting his support from unions.

Polls close at 8 p.m. EDT in Pennsylvania on Tuesday. Please check ABCNews.com for election results.

ABC News’ Soorin Kim contributed to this report.

WATCH LIVE TONIGHT: You can watch livestreaming coverage of Pennsylvania’s special election as part of ABC News’ “18 for 18” coverage of the midterm elections starting at 8 p.m. ET on ABCNews.com or on the ABC News app available on the Apple App Store, GooglePlay Store, Apple TV App Store, and Roku Channel Store. Don’t forget to sign up for Midterm Elections Alerts to get more coverage of this year’s election season as par from our powerhouse politics team.

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