President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE criticized Republican Alabama Senate candidate Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE early Wednesday, asserting that his former attorney general didn’t win the state's GOP primary outright because of what Trump described as Sessions's lack of “wisdom or courage” in his handling of the Russia investigation.

“This is what happens to someone who loyally gets appointed Attorney General of the United States & then doesn’t have the wisdom or courage to stare down & end the phony Russia Witch Hunt,” Trump tweeted, just hours after news broke that Tuesday’s Senate primary in Alabama would advance to a runoff between Sessions and former Auburn football coach Tommy Tuberville.

“Recuses himself on FIRST DAY in office, and the Mueller Scam begins!” Trump added.

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Trump’s critical tweet about Sessions suggests the president may seek to boost Tuberville in the runoff election. Trump has thus far stayed out of the race, though a source familiar with the situation told The Hill last month that Trump could support Sessions’s opponent if the race advanced to a runoff. Still, Wednesday's tweet did not contain an explicit endorsement of Tuberville.

Trump repeatedly and publicly eviscerated Sessions for his decision to recuse himself from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation into Russian interference during his tenure as attorney general.

Sessions, who was the first senator to endorse Trump's White House bid and served as a surrogate on his 2016 campaign, recused himself from any investigation into Russian meddling in the 2016 election in March 2017, after coming under scrutiny for his contacts with the Russian ambassador while a senator.

Sessions resigned at Trump’s request the day after the 2018 midterm elections, capping a tumultuous stint atop the Justice Department. William Barr Bill BarrBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Trump says mail ballots greater election threat than foreign interference Barr told federal prosecutors to aggressively charge protesters with crimes: report MORE has since replaced him.

Sessions was a veteran of the Senate before joining the Trump administration, having held an Alabama seat for 20 years.

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He announced his Alabama Senate campaign last November and, like the other candidates in the race, has embraced Trump's agenda and worked to convince voters that he supports the president, who remains very popular among Republican voters.

Sessions and Tuberville were running neck and neck after polls closed Tuesday night — Sessions held 31.6 percent of the vote and Tuberville 33.4 percent with 99 percent of precincts reporting.

Both candidates will compete for the Republican nomination in the March 31 runoff, and the winner will face Sen. Doug Jones in the November election. Jones is considered the most vulnerable Democratic senators facing reelection in 2020.