Count Michael Cohen, President Trump’s former lawyer who’s serving a three-year sentence in federal prison, among those frustrated by former special counsel Robert Mueller’s performance on Capitol Hill.

Cohen, who watched the testimony with other inmates at the Federal Correctional Institution Otisville in upstate Orange County, said he was let down by Mueller’s “reluctance” to go beyond the report of his two-year investigation into Russian meddling in the 2016 election.

“Mr. Mueller today had the world stage to answer questions regarding obstruction of justice and witness tampering. Sadly, his reluctance just continues to leave the debate open and those responsible free from prosecution … for the moment,” he wrote in a statement to CNN. “The American people deserve more!”

The former special counsel appeared for about seven hours before the House Judiciary and Intelligence committees on Wednesday.

He appeared to frustrate both Democratic and Republican lawmakers on the panel by confining his testimony to the 448-page report he released in March.

Cohen pleaded guilty to tax evasion, lying to Congress and campaign finance violations pertaining to hush-money payments he made to two women who claimed they had affairs with President Trump.