President TrumpDonald John TrumpPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash CNN's Anderson Cooper mocks WH press secretary over Fox News interview MORE and some lawmakers are reportedly considering supporting an app that would conduct background checks before gun sales as a gun control measure, The Washington Post reported. 

The app would be connected to the National Instant Criminal Background Checks system that could be used to complete background checks on private gun sales, three senators and other officials told The Washington Post. 

However, lawmakers and congressional aides have privately raised privacy concerns for gun owners about the app idea. 

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Senate Majority Whip John ThuneJohn Randolph ThuneGOP cautions Graham against hauling Biden before Senate War of words at the White House Lawmakers toast Greta Van Susteren's new show MORE (R-S.D.) told The Washington Post that he was told about the app by a White House official. Thune said he was concerned gun owners’ personal data being available, adding that it “would kind of be a de facto registry.”  

“It’s fraught with a lot of issues when it comes to some of the Second Amendment concerns,” Thune said. 

There are no current federally mandated background checks for the private sales of guns.

Kris Brown, president of Brady, a gun violence prevention advocacy group, called on the Senate to take up a background check bill that would include private gun sales, CNN reported.

"This proposal reveals one important fact from the White House: they recognize the problem of the private sale loophole that allows 20 percent of guns to be sold with no background check at all. ... We agree the private sale loophole must be fixed, but it should be fixed in a way that allows meaningful enforcement, not easy circumvention that endangers lives," Brown said.

News of the app came as lawmakers expect Trump to unveil his plan to reduce gun violence next week. Senior advisors briefed Trump on various gun safety measures this week but he did not seem concerned with the details of how each plan would work, an unnamed source confirmed to CNN. 

Trump has also met with lawmakers on potential gun control plans, including Sens. Joe ManchinJoseph (Joe) ManchinOvernight Energy: Perry to step down as Energy secretary | Future of big-game hunting council up in the air | Dems lose vote against EPA power plant rule Senate Dems lose forced vote against EPA power plant rule Schumer seeks focus on health care amid impeachment fever MORE (D-W.Va.) and Chris MurphyChristopher (Chris) Scott MurphyPelosi, Schumer hit 'flailing' Trump over 'sham ceasefire' deal Romney slams ceasefire deal, calls Trump's Syria move 'a bloodstain' in US history Backlash erupts at video depicting Trump killing media, critics MORE (D-Conn.), among others.