Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.) blasted 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 and his allies on Friday, asserting they are "trying to excuse" the president’s efforts to potentially obstruct 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.

Amash, who last month became the only Republican to call for Trump's impeachment, said in a lengthy Twitter thread that "with Mueller’s report now out, the White House no longer has anything positive to say about Mueller and his team."

“The president and his allies are instead trying to excuse Trump’s efforts to obstruct the entire investigation into Russian election interference by alleging problems with elements of it and claiming, without basis, that they undermine Mueller’s obstruction analysis," Amash wrote.

The president and his allies are instead trying to excuse Trump’s efforts to obstruct the entire investigation into Russian election interference by alleging problems with elements of it and claiming, without basis, that they undermine Mueller’s obstruction analysis. — Justin Amash (@justinamash) June 7, 2019

The Michigan Republican, a vocal Trump critic, took particular aim at Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE for initially saying Mueller had cleared Trump on the topic of obstruction before the special counsel's report had been released.

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Mueller later maintained that he could not reach a prosecutorial decision on the issue, citing Justice Department guidelines saying a sitting president cannot be indicted. He said instead that Congress has authority to conduct obstruction probes.

Trump had initially reacted positively to the Mueller report after Barr’s announcement characterizing the special counsel's findings, though the president was quick to condemn Mueller once his report was actually released.

Amash noted in his thread Friday that "Mueller’s report is damning for the president" and maintained that "[i]f Barr’s letter had accurately reflected the report, the White House would not have reacted positively."

Since the report’s release, Trump and his allies on Capitol Hill have gone on the offensive against Mueller in an attempt to cast him and his team as conflicted and questioning his ability to be an objective investigator.

Mueller cited 10 “episodes” of times Trump may have obstructed probes into Russian meddling in the 2016 election but declined to bring charges against him. Still, he maintained at a press conference last month that his report did not exonerate the president.

“If we had had confidence that the president clearly did not commit a crime, we would have said so,” Mueller said. “We did not, however, make a determination as to whether the president did commit a crime.”

Amash has emerged as one of the most vocal Republican critics of Trump, raising eyebrows last month when he said he believed the president engaged in “impeachable conduct,” citing several examples Mueller laid out in his report of potentially obstructive behavior.

Amash’s criticism has made him a virtual pariah within the GOP. Though he says some Republicans privately sympathize with his comments, the conservative House Freedom Caucus, of which Amash is a member, voted last month to condemn his remarks and Trump called him a “loser" and "total lightweight."