Elie Honig, a former federal prosecutor in the Southern District of New York, told me that Trump’s decision to oust Sessions and replace him with Whitaker probably wouldn’t be considered an obstructive act in and of itself. But it could add to the “totality of the circumstances” surrounding a series of moves Trump has taken to try to stymie the Russia investigation since early last year, Honig said, including his firing of former FBI Director James Comey and his attacks on Sessions.

David Kris, a founder of Culper Partners who served as the assistant attorney general for the DOJ’s National Security Division from 2009 to 2011, said it was “obvious” that Trump was motivated “by his well-expressed feelings of dislike toward the Mueller investigation. There can be no serious question about that.” Kris, like Honig, said that ousting Sessions and appointing Whitaker “could be another element in a bill of particulars” used by prosecutors to specify the ways that Trump “has used the powers of the presidency toward a corrupt end.”

With the midterms out of the way, however, Trump evidently feels freer to make changes to his Cabinet, regardless of how it may be perceived by investigators who have been closely examining his behavior for signs of corrupt intent with regard to the Russia investigation over the last 18 months.

Read: The lingering mysteries of a Trump-Russia conspiracy

Whitaker will be the acting attorney general until a permanent replacement is nominated, Trump tweeted on Wednesday, and he’ll be overseeing the Mueller investigation directly in his new post. While he has touted Mueller’s character—“There is no honest person that sits in the world of politics, in the world of law, that can find anything wrong with Bob Mueller,” he told CNN last year—he seems to have already formed an opinion on the probe itself. In a tweet, Whitaker said an article that characterized Mueller’s investigators as a “lynch mob” was a “must read,” and he told CNN that if Sessions were fired, his replacement could “reduce” Mueller’s budget in such a way that it would grind his investigation almost to a halt. He also shared an article on Twitter that explored the process by which Trump could fire Mueller, said in a radio interview that “there is no criminal obstruction-of-justice charge to be had” against Trump, and defended the Trump campaign’s decision to meet with Russian nationals to obtain dirt on Hillary Clinton—a meeting Mueller has been closely examining.“You would always take the meeting,” Whitaker told CNN last year. “You certainly want to have any advantage, any legal advantage you can.” Whitaker is also friendly with Sam Clovis—a key grand-jury witness in the Mueller probe—and chaired his state-treasurer campaign in 2014.

Whitaker most clearly expressed his view of the Mueller probe in an op-ed last year, writing that the inquiry had gone “too far,” and arguing that the president’s personal finances were a “red line” that the special counsel had come “dangerously close to crossing.” (Mueller subpoenaed the Trump Organization earlier this year, but it is not clear which documents his team had requested. ) Whitaker added that “investigating Donald Trump’s finances or his family’s finances falls completely outside of the realm of his 2016 campaign and allegations that the campaign coordinated with the Russian government or anyone else. That goes beyond the scope of the appointment of the special counsel.”