President TrumpDonald John TrumpThe Hill's Morning Report - White House, Congress: Urgency of now around budget GOP presses Trump to make a deal on spending Democrats wary of handing Trump a win on infrastructure 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 ClintonThe Memo: Trump faces steep climb to reelection What the Mueller report tells us about Putin, Russia and Trump's election Steve Bullock puts Citizens United decision at center of presidential push 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 WatersDemocrats are running out of stunts to pull from impeachment playbook Maxine Waters: Trump 'has done everything that one could even think of to be eligible for impeachment' Maxine Waters: Parts of Trump immigration plan are 'very racist' MORE (Calif.) and former Attorney General Eric HolderEric Himpton HolderEric Holder: 'There are grounds for impeachment' in Mueller report Prosecutor appointed by Barr poised to enter Washington firestorm Dems struggle to make Trump bend on probes 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 BaldwinThis week: House to vote on bill to ban LGBTQ discrimination Overnight Defense — Presented by Huntington Ingalls Industries — Pentagon approves transfer of .5B to border wall | Dems blast move | House Dem pushes Pelosi to sue over Trump's Yemen veto Pentagon approves transfer of .5B to Trump border wall from Afghan forces, other accounts 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.