Constitutional reforms were proposed on Tuesday by two senators , one of them a member of Samper 's own Liberal Party , aimed at lifting the ban on extradition introduced in 1991 .
<response> Constitutional reforms were proposed on Tuesday by two senators , one of them a member of <person>Samper</person> 's own <organization>Liberal Party</organization> , aimed at lifting the ban on extradition introduced in 1991 . </response>