A Michigan Republican and member of the House Freedom Caucus accused President Trump of “impeachable conduct” in a break with his party.

Rep. Justin Amash (R-Mich.) tweeted Saturday that the president’s actions to potentially obstruct the now-shuttered special counsel investigation warrant impeachment by the House. He also accused Attorney General William Barr of “deliberately misrepresenting” Robert Mueller’s report of the investigation’s findings.

“Here are my principal conclusions: 1. Attorney General Barr has deliberately misrepresented Mueller’s report. 2. President Trump has engaged in impeachable conduct. 3. Partisanship has eroded our system of checks and balances. 4. Few members of Congress have read the report,” Amash wrote Saturday afternoon.

“Mueller’s report reveals that President Trump engaged in specific actions and a pattern of behavior that meet the threshold for impeachment,” the Michigan Republican continued. “Mueller’s report identifies multiple examples of conduct satisfying all the elements of obstruction of justice, and undoubtedly any person who is not the president of the United States would be indicted based on such evidence.”

In other tweets, Amash accused Barr of “sleight-of-hand” to obscure the findings of Mueller’s report in his own summary released to Congress earlier this year.

“In comparing Barr’s principal conclusions, congressional testimony, and other statements to Mueller’s report, it is clear that Barr intended to mislead the public about Special Counsel Robert Mueller’s analysis and findings,” Amash wrote.

Amash has been a frequent critic of Trump. He has previously said he will not rule out running for the Libertarian Party nomination for president next year.

Amash also co-sponsored a resolution to block Trump’s emergency declaration earlier this year.

“Barr’s misrepresentations are significant but often subtle, frequently taking the form of sleight-of-hand qualifications or logical fallacies, which he hopes people will not notice.”

Amash’s statements make him the first Republican in the House to come out publicly in support of impeachment proceedings, even as Democratic leadership has hesitated to bow to demands from dozens of House Democrats who support the issue and come out in support of impeachment.