washington u.s. senators call president barack obama administration friday impose target sanction officials democratic republic congo responsible violence right violations amid rise political tensions hop increase pressure government president joseph kabila three obama fellow democrats senators richard durbin edward markey christopher murphy say friday introduce senate resolution week call kabila government fulfill constitutional mandate democratic transition power late year call target sanction include visa ban asset freeze kabila publicly commit peaceful transition power action reflect grow international worry situation african nation unite nations secretary-general ban ki-moon wednesday voice concern report rise political tension due uncertainty presidential election dozens kabila critics arrest since last year part unite nations right group say escalate crackdown political dissent ahead presidential election schedule november kabila ineligible stand re-election serve two elect term opponents accuse try delay poll hold onto power congo high court rule last week president could stay power elections occur end mandate thursday protester police officer kill goma eastern part country protest possible elections delay unite nations say dozens people arrest opposition leaders accuse kabila stall vote order extend 15-year rule president deny democratic congressional aid say expect add co-sponsors resolution congress return memorial day recess june 6. bipartisan support u.s. action address situation republican senator jeff flake chairman foreign relations committee africa subcommittee tell reuters brief interview week felt sanction would appropriate discuss u.s. state department officials hopefully together flake say think want make sure whatever push right direction senators want obama impose sanction congo