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's attorneys in the Russia investigation and White House press secretary Sarah Huckabee Sanders disputed on Wednesday that Trump was directing Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE to end 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 in a tweet earlier in the day.

As part of a barrage of attacks on the Mueller investigation on Wednesday morning, Trump tweeted that Sessions "should stop this Rigged Witch Hunt right now, before it continues to stain our country any further."

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However, Trump lawyers Jay Sekulow and Rudy Giuliani argued to The Washington Post that Trump was merely expressing an opinion.

“The president has issued no order or direction to the Department of Justice on this,” Sekulow told the Post.

Giuliani pointed to Trump's use of the word "should" and added that the president "uses tweets to express his opinion."

And at Wednesday's press briefing, Sanders said the tweet was "not an order. It's the president's opinion."

Trump's call for Sessions to end the Mueller investigation marked an escalation in his long-running criticism of the special counsel.

He has periodically chastised Sessions for recusing himself from overseeing the probe but had previously refrained from outright asking the attorney general to put a stop to it.

Sessions, the former Alabama senator who served as a top Trump campaign adviser, recused himself in March 2017 from the Russia probe after it was revealed he failed to disclose a conversation he had with Russia's U.S. ambassador during the 2016 race.

As a result, Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE is overseeing the investigation. Rosenstein appointed Mueller as special counsel in May 2017, after Trump fired Comey as FBI director.

Trump's tweet comes one day after his former campaign chairman, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, went on trial for alleged tax, financial and bank fraud crimes, the biggest test yet for the Mueller probe.

It also adds to a growing list of tweets that Mueller is reportedly looking at as part of an investigation into whether the president obstructed justice.

Updated at 1:48 p.m.