Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE's former Republican colleagues in the Senate are throwing their support behind the embattled top Justice Department official as he faces mounting criticism from President Trump.

During the 2016 presidential race, Sessions, then a Republican senator for Alabama, was among Trump's earliest and most fervent political allies. Sessions frequently campaigned for Trump and praised his calls to crack down on illegal immigration and crime.

But Trump appears to have soured on his attorney general over his March decision to recuse himself from the Justice Department investigation into Russia's election meddling after reports that Sessions failed to disclose contacts with the Russian ambassador to the U.S. during his confirmation hearing.

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Speculation has emerged that Sessions's future at the Justice Department could be in jeopardy, prompting several Republican senators to speak out on Tuesday in support of Sessions.

"I join the people of Alabama in giving Jeff Sessions my deep respect and unwavering support," Sen. Richard Shelby (R-Ala.), who served alongside Sessions in the Senate for 20 years, wrote on Twitter.

During the past twenty years that I have served with Jeff Sessions in the Senate, I have had the opportunity to know him well. 1/3 — Richard Shelby (@SenShelby) July 25, 2017

Jeff Sessions is a man of integrity, loyalty, and extraordinary character. 2/3 — Richard Shelby (@SenShelby) July 25, 2017