President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Wednesday revived his attacks on Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.), one day before the president is set to hold a rally for Tester's political opponent.

The president lambasted Tester over his handling of workplace misconduct allegations against White House doctor and Trump's one-time Secretary of Veterans' Affairs nominee, Adm. Ronny Jackson.

"Ever since his vicious and totally false statements about Admiral Ron Jackson, the highly respected White House Doctor for Obama, Bush & me, Senator John Tester looks to be in big trouble in the Great State of Montana!" Trump wrote in a tweet, misspelling Tester's first name.

He went on to compare Tester's actions to Democrats' behavior when Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughTrump faces tricky choice on Supreme Court pick The Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE was accused of sexual assault, suggesting the Montana Democrat's actions were worse.

Ever since his vicious and totally false statements about Admiral Ron Jackson, the highly respected White House Doctor for Obama, Bush & me, Senator John Tester looks to be in big trouble in the Great State of Montana! He behaved worse than the Democrat Mob did with Justice K! — Donald J. Trump (@realDonaldTrump) October 18, 2018

Trump's renewed criticism of Tester came on the eve of a campaign rally in Missoula, Mont., for Tester's Senate opponent, Matt Rosendale (R).

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After Jackson was nominated to head the VA in April, Tester's office released allegations that the White House doctor fostered a hostile work environment, improperly dispensed prescription drugs and drank on the job. The claims were based on interviews with colleagues of Jackson's.

Jackson and the White House both denied the allegations, but the doctor ultimately withdrew his nomination.

While Trump launched a barrage of attacks on Tester in response, Sen. Johnny Isakson (R-Ga.), the top Republican on the Veterans' Affairs Committee, broke with Trump and his blistering criticism of Tester to come to the Democrat's defense, saying he did not have a problem with how the allegations were handled.

Tester is among the most vulnerable Democrats up for re-election next month, as Trump won Montana by more than 20 percentage points in the 2016 election.

The Cook Political Report, a nonpartisan election forecaster, rates the Montana Senate election as a "toss-up," and a RealClearPolitics average of polls in the race shows Tester with a 3-point lead.