Rep. Justin Amash Justin AmashOn The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon Trump says he's considering Snowden pardon MORE (R-Mich.) criticized Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE on Friday for reversing Obama-era guidelines on criminal charges and sentencing.

Sessions instructed federal prosecutors Friday to charge defendants with the most serious crime possible.

"Let's pass criminal justice reform to put an end to this unjust, ineffective, and costly policy," Amash, one of the Trump administration's most vocal GOP critics, wrote on Twitter.

Let's pass criminal justice reform to put an end to this unjust, ineffective, and costly policy. https://t.co/BTT5aKY0Aj — Justin Amash (@justinamash) May 12, 2017

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Sessions released a memo presenting a radical departure from the Obama administration’s approach to criminal charging and sentencing, which called for prosecutors to avoid charges that could trigger heavy mandatory minimum sentences.

“It is a core principle that prosecutors should charge and pursue the most serious, readily provable offense,” Sessions wrote.

“This policy affirms our responsibility to enforce the law, is moral and just, and produces consistency,” Sessions added. “This policy fully utilizes the tools Congress has given us.”

“By definition, the most serious offenses are those that carry the most substantial guidelines sentence, including mandatory minimum sentences.”

The memo marks a drastically different take on drug-related offenses than the one practiced by former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE, who issued the 2013 order directing prosecutors to avoid mandatory minimums.

Sessions’s memo marks the Trump administration’s first major rollback of Obama administration criminal justice reforms.

President Trump touted himself as the “law-and-order candidate” during his 2016 campaign.

Trump repeatedly vowed to stifle the drug trade and often derided former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE’s law enforcement policies.

The new guidelines instruct prosecutors to “disclose to the sentencing court all facts that impact the sentencing guidelines or mandatory minimum sentences.”

Holder’s policies directed prosecutors not to disclose the quantity of drugs to courts to avoid strict mandatory minimum sentences.

Holder's guidelines did not apply to defendants who were gang leaders or repeat criminal offenders.