A federal judge in Minnesota has blocked the release of a former state senator accused of soliciting a teenage girl for sex after he allegedly tried to obstruct the investigation.

A judge on Monday blocked the release of a former Minnesota state senator charged with soliciting a minor, after prosecutors leveled fresh allegations that he tried to obstruct the FBI's investigation from jail.

Federal prosecutors have asked a court to reconsider its decision to allow former Minnesota Sen. Justin Eichorn to leave jail, citing concerns that the ex-public official lied to authorities after being charged in an underage sex sting.