One of the largest progressive veterans groups in the country is launching a new campaign against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Monday that seeks to raise pressure on several Republican senators up for reelection next year.

To mark Veterans Day, VoteVets will fly planes over key Senate battleground states like North Carolina, Arizona, Kentucky and Colorado Monday morning, with a banner that reads: “Vets: Trump is a National Security Threat.” The group seeks to specifically target Sen. Thom Tillis Thomas (Thom) Roland TillisOvernight Energy: Trump officials finalize plan to open up protected areas of Tongass to logging | Feds say offshore testing for oil can proceed despite drilling moratorium | Dems question EPA's postponement of inequality training On The Trail: Making sense of this week's polling tsunami Feds say offshore testing for oil can proceed despite drilling moratorium MORE (R-N.C.), Sen. Martha McSally Martha Elizabeth McSallyOn The Trail: Making sense of this week's polling tsunami The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.), Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (Ky.) and Sen. Cory Gardner Cory Scott GardnerBreaking the Chinese space addiction Trump dumbfounds GOP with latest unforced error Billionaire who donated to Trump in 2016 donates to Biden MORE (R-Colo.).

“In less than a year, voters will go to the polls. We intend to remind them every day between now and then that Donald Trump is a national security threat and that these key Senate Republicans encourage and enable him at every step of the way,” Jon Soltz, chairman of VoteVets, wrote in a statement announcing the campaign.

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In addition to the planes, the group also plans to run digital ads and to launch a website detailing all the ways in which Trump has posed a national security threat to the United States. This includes everything from allegedly “inviting foreign interference in our elections” to “raiding funds for our military families to build his wall.”

VoteVets is spending roughly $30,000 in total on the campaign.

Though the progressive group has long been critical of Trump, this marks the first time VoteVets has launched a political initiative on Veterans Day.

The move comes as Republicans look to hold on to the Senate in the 2020 elections.

The Cook Political Report has labeled the races for Senate seats held by Gardner and McSally as “toss-ups” and has rated Tillis’s race as “lean Republican” and McConnell's as “likely Republican.”