Sen. Richard Blumenthal (D-Conn.) is warning President Trump's allies that they shouldn't expect a pardon in the ongoing Russia investigation should there be any convictions.

The Democratic lawmaker on Saturday tweeted that targets of the investigation should still feel compelled to testify.

"Any witness counting on a Russia investigation pardon should think again," Blumenthal tweeted, linking to an earlier report from The Hill quoting Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.), who said that Trump's pardon of former Sheriff Joe Arpaio was a signal to those targeted by the Justice Department.

"Trump's loyalty is limited, witnesses can still be compelled to testify, and the pardons apply only to federal crimes," he added.

Any witness counting on a Russia investigation pardon should think again. https://t.co/Hlib0hG9rB — Richard Blumenthal (@SenBlumenthal) August 27, 2017

Trump's loyalty is limited, witnesses can still be compelled to testify, and the pardons apply only to federal crimes. — Richard Blumenthal (@SenBlumenthal) August 27, 2017

Special Counsel Robert Mueller has been investigating alleged ties between the Trump campaign and Russia during the 2016 election.

Blumenthal's warning comes after speculation from Democrats that Trump pardoned former Arpaio as a way of reminding his allies that he values loyalty and rewards it in kind.

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Trump signed the order pardoning former Maricopa County Sheriff Joe Arpaio on Friday after weeks of speculation.

Arpaio had been found guilty in a Justice Department investigation of racially profiling Latinos. He was convicted July 31 of criminal contempt for disobeying a federal judge's order on detaining individuals suspected of being in the U.S. illegally.