President TrumpDonald John TrumpPapadopoulos claims he was pressured to sign plea deal Tlaib asking colleagues to support impeachment investigation resolution Trump rips 'Mainstream Media': 'They truly are the Enemy of the People' MORE's supporters chanted “lock her up” ahead of his arrival at a rally in Mosinee, Wis., on Wednesday evening, just hours after the Secret Service said it found "potential explosive devices" in mail sent to former Secretary of State Hillary ClintonHillary Diane Rodham ClintonPapadopoulos claims he was pressured to sign plea deal Here's why Biden, Bernie and Beto are peaking The Hill's Morning Report - Presented by Pass USMCA Coalition - Dems look for traction following Barr-Mueller findings MORE at her home in Chappaqua, New York.

Video of the rally showed the crowd chanting the phrase as Sen. Leah Vukmir (R) delivered remarks shortly before Trump’s scheduled appearance.

The chant, which has become a regular feature of Trump's rallies since his presidential campaign, came hours after authorities discovered potential explosive devices had been sent to Clinton’s New York residence, in addition to other Democrats including former President Obama, Rep. Maxine WatersMaxine Moore WatersHouse committee chairs call for Mueller report to be released by April 2 On The Money: Taxpayers slow to file as they grapple with tax law | Schiff says Dems to charge ahead with Trump probes | Feds charge Avenatti with trying to extort Nike | Yellen sees no recession in sight Judd Gregg: Pelosi's olive branch...sort of MORE (Calif.) and former Attorney General Eric HolderEric Himpton HolderEric Holder: 'We're really at the beginning' of questions about Trump obstructing justice What should Democrats do next, after Mueller's report? GOP eager to exploit Dem court-packing fight MORE.

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Each of those targeted by the suspicious packages have been criticized repeatedly by Trump, who condemned the attempted attacks as “abhorrent” during remarks from the White House East Room on Wednesday afternoon.

“We are extremely angry, upset, unhappy about what we witnessed this morning and we will get to the bottom of it,” he said.

White House press secretary Sarah Huckabee Sanders also said the president and administration officials are monitoring the developments.

"Our condemnation of these [despicable] acts certainly includes threats made to CNN as well as current or former public servants. These cowardly acts are unacceptable and wont be tolerated," she tweeted.

Clinton and other bipartisan lawmakers called for officials to dial back their rhetoric in response to the attempted attacks.

Trump was stumping for Wisconsin Gov. Scott Walker (R) in his reelection bid against state schools superintendent Tony Evers (D), and Leah Vukmir, who is challenging Wisconsin Sen. Tammy BaldwinTammy Suzanne BaldwinTrump mounts Rust Belt defense On The Money: Trump issues emergency order grounding Boeing 737 Max jets | Senate talks over emergency resolution collapse | Progressives seek defense freeze in budget talks Dems offer bill to end tax break for investment-fund managers MORE (D).

Walker is battling Evers in a tight race, which RealClearPolitics has dubbed a "toss-up." A RealClearPolitics average of polling gives Evers a 3.6 percentage point edge in the race. 

Baldwin has a double-digit lead over Vukmir, according to a recent Marquette Law School survey of likely voters.

--Updated on Oct. 25 at 7:33 a.m.