President TrumpDonald TrumpLil Wayne gets 11th hour Trump pardon Trump grants clemency to more than 100 people, including Bannon Trump expected to pardon Bannon: reports 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 ClintonGOP Rep Marjorie Taylor Greene referred to Parkland school shooting as 'false flag' event on Facebook Senators vet Mayorkas to take lead at DHS CNN poll: Melania Trump leaving office as least popular first lady ever 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 WatersCapitol Police report warned that Congress could be targeted three days before riot Democrats point fingers on whether Capitol rioters had inside help Lawmakers warned police of possible attack ahead of siege MORE (Calif.) and former Attorney General Eric HolderEric Himpton HolderWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Joe Biden's continued 'Russian misinformation' defense of Hunter is conspiracy-level laughable Tyson fires 7 after probe into managers coronavirus betting 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 BaldwinSenate Democrats call on Biden to immediately invoke Defense Production Act Seven Senate races to watch in 2022 Senate Democrats urge Google to improve ad policies to combat election disinformation 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.