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TMZSports.com

Chuck Liddell[1] clearly believes Cain Velasquez[2] should be out of jail by now ... telling TMZ Sports a judge needs to give him bond ASAP.

The UFC legend has been locked behind bars since late February -- after he allegedly tried to kill a man[3] who was accused of molesting[4] one of his relatives.

Liddell -- who's been good friends with Velasquez for years -- told us out at LAX this week it's time for that to change ... saying Cain should be let out and able to see his family.

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[5]

"It's so funny how easy it is to get out -- they're letting all these crazy people out," the Iceman said. "But you have a problem with letting him out? I don't know."

Liddell went on to say, if all of the allegations are true, he doesn't blame Velasquez one bit for it all -- obviously, a big reason why he thinks the 40-year-old should get bond.

"I get it," Chuck said. "In that situation, I get it."

Cain, though, will remain in jail until at least his next hearing on June 10.

San José Police Department

[6]

Chuck, meanwhile, is pleading with the former fighter to "stay strong" while the case plays out ... saying, "We're here for you. We love you."

As we reported, Velasquez -- who's already been denied bail twice[7] -- is facing a myriad of criminal charges[8], including felony attempted murder. He could spend serious time in prison if convicted on all counts.

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