Sen. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.), a 2020 presidential contender, on Wednesday called for hearings by the Senate Judiciary Committee on reports Immigration and Customs Enforcement (ICE) is using solitary confinement.

In a letter to Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.), Booker cites May reports by NBC News and The Intercept that ICE placed thousands of immigrants in solitary confinement between 2012 and 2017, in many cases reportedly even if they hadn't violated any rules.

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Booker also notes that the report claims nearly one-third of those immigrants had a mental illness, including a Ukrainian man who was placed in solitary confinement for 15 days for placing half a green pepper in his sock.

"ICE’s own policy seems to recognize the dangers of solitary confinement. The policy states that the '[p]lacement of detainees in segregated housing is a serious step that requires careful consideration of alternatives. ... In particular, placement in administrative segregation due to a special vulnerability should be used only as a last resort and when no other viable housing options exist,'" Booker’s letter reads.

"It appears ICE has been consistently violating its own policy on the use of solitary confinement," he adds.

Booker’s letter also addresses President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's threat earlier in June that ICE would carry out major deportations. Trump initially said the raids were planned for Sunday but later said they would be postponed.

"These raids have been rejected by then-Secretary of the Department of Homeland Security (DHS), Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE, and then-Acting Director of ICE, Ronald Vitiello," Booker writes.

"At a time when the Trump Administration is claiming it does not have enough money to deal with the humanitarian crisis at the Southwest border, it is puzzling how DHS has enough resources to conduct large-scale raids all across the United States," he adds.

In the letter, Booker credits Graham with scheduling hearings on what he calls the “humanitarian crisis” at the U.S.-Mexico border but writes that “ICE has become nothing more than a lethal weapon in the Trump Administration’s war on immigrants and communities of color, and we cannot be silent.”