Letters sent from prison by notorious mob boss James "Whitey" Bulger in the last months of his life reveal his thoughts on various subjects, including repeated praise for 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.

NBC News reported Saturday that Bulger wrote in letters to various recipients of his support for Trump and anger at the news media, which he argued would attack the president while helping Democrats.

"Trump is tough and fights back instead of bowing down to pressure — and caving in to press! U.S. agrees with him press attacking and his reaction increases his popularity — He has my vote so far," Bulger wrote last August, nearly two years after Trump's election, according to NBC.

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"My bet is he's happy with present wife and settled down," he reportedly wrote in another letter. "No way would he wind up in Oval Office with a Monica Lewinsky — That was a scandal! Same media that attacks Trump would cover up for Bill Clinton William (Bill) Jefferson ClintonEpstein podcast host says he affiliated with elites from 'both sides of the aisle' Ruth Bader Ginsburg lies in repose at Supreme Court Business groups start gaming out a Biden administration MORE."

Bulger also went after another target in his letters: 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, whose nearly two-year investigation into the Trump campaign and Russian election interference concluded earlier this year.

"Trump is experiencing what Mueller and company can orchestrate," Bulger reportedly wrote in September, a month before his death. "[Mueller] should observe biblical saying - 'Let he who is without sin cast the first stone.'"

Bulger was killed last fall in his prison cell shortly after being transferred to the West Virginia facility. The 89-year-old former Boston crime boss was facing life sentences for 11 murders and other charges.

Captured in 2011 after more than a decade on the run from police, Bulger was reportedly killed by two inmates including a former mob hitman.