Former Ohio Gov. John Kasich (R) on Saturday excoriated President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE over details in 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 report, declaring that "America deserves better."

Kasich, who is mulling launching a Republican presidential primary challenge to Trump in 2020, tweeted that Trump's behavior in the Mueller report "is more than disappointing."

"It’s unacceptable & not behavior we should expect from our president. It's worse than I've seen in my career observing & working with presidents or public officials," he wrote.

.@realDonaldTrump's behavior described in the #MuellerReport is more than disappointing. It’s unacceptable & not behavior we should expect from our president. It's worse than I've seen in my career observing & working with presidents or public officials. America deserves better. — John Kasich (@JohnKasich) April 20, 2019

In a sprawling 448-page report released Thursday, Mueller said that his team could "not establish that members of the Trump Campaign conspired or coordinated" with Russian efforts to interfere in the 2016 election.

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However, Mueller stopped short of clearing Trump regarding potential obstruction of justice involving the Russia probe itself, saying that Congress has the authority to conduct obstruction investigations.

The special counsel’s team examined 10 “episodes” of possible obstruction, including several instances in which Trump urged his associates to lie to the public or try to have Mueller fired.

“The President's efforts to influence the investigation were mostly unsuccessful, but that is largely because the persons who surrounded the President declined to carry out orders or accede to his requests,” Mueller wrote.

Kasich has emerged as one of the few Republican critics of the president, focusing much of his ire on Trump’s conduct while in office. He has been weighing a potential primary challenge to Trump, saying this week that “all of my options remain on the table.”

The former Ohio governor has also been in touch with former Massachusetts Gov. William Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE (R), who has formally announced a campaign to challenge Trump for the GOP nomination next year. Weld said this week that he has encouraged Kasich to throw his hat into the ring as well.