A former Watergate prosecutor late Wednesday criticized 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 attorney Rudy Giuliani over his explanation that Trump was merely issuing an "opinion" when he called for 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 the special counsel probe.

"I think it’s a very weak defense," assistant Watergate special prosecutor Jill Wine-Banks said on MSNBC's "The Last Word with Lawrence O'Donnell."

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"It is a question for the jury as to whether 'should' is an order or just an opinion. And I think when presented to a jury, they would find in the context of all of the other tweets that the president has done and all the other actions he has taken, including the firing of [former FBI Director] James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE, that they would find the word 'should' was an order."

Wine-Banks argued that Trump's tweet on Wednesday calling for Sessions to immediately end the probe into Russian interference in the 2016 presidential election was sent with the intention that Sessions obey it and that Trump has "undermined" the probe from the beginning.

Sessions, who previously served as an adviser to the Trump campaign, recused himself from probes involving Russia last year. Sessions's recusal left his deputy, 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, as the highest-ranking Justice Department official overseeing the probe. Rosenstein then appointed 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 as special counsel after Trump fired Comey.

"He has polluted any possible impact on a potential jury in any case because of what he is saying," Wine-Banks argued of Trump on MSNBC.

Trump ratcheted up his attacks on the Mueller probe on Wednesday, tweeting that Sessions "should stop this Rigged Witch Hunt right now, before it continues to stain our country any further."

..This is a terrible situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further. Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA! — Donald J. Trump (@realDonaldTrump) August 1, 2018

Trump lawyers Jay Sekulow and Giuliani later asserted that Trump was expressing an opinion in his tweet, with Giuliani pointing to the word "should" to support his argument.

In a press briefing, White House press secretary Sarah Huckabee Sanders echoed that line, saying that the tweet was the president's opinion.

Mueller is reportedly looking at Trump's tweets as part of an investigation into whether the president obstructed justice.