President TrumpDonald John TrumpNew Jersey incumbents steamroll progressive challengers in primaries Tucker Carlson ratchets up criticism of Duckworth, calls her a 'coward' Trump on Confederate flag: 'It's freedom of speech' 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 ClintonSusan Collins signals she won't campaign against Biden Cuccinelli says rule forcing international students to return home will 'encourage schools to reopen' Clinton labels ICE decision on international students 'cruel' and 'unnecessary' 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 WatersOn The Money: Mnuchin, Powell differ over how soon economy will recover | Millions fear eviction without more aid from Congress | IRS chief pledges to work on tax code's role in racial wealth disparities Millions fear eviction without more aid from Congress House approves statehood for DC in 232-180 vote MORE (Calif.) and former Attorney General Eric HolderEric Himpton HolderTrump official criticizes ex-Clinton spokesman over defunding police tweet Obama to speak about George Floyd in virtual town hall GOP group launches redistricting site 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 BaldwinBiden campaign adds staff in three battleground states Clinton, Buttigieg among Democrats set to hold virtual events for Biden Warren top choice for VP for some Black progressives 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.