If this is the pressure line, you have to replace it. If it is the return line, you can cut out the bad section and replace it with bulk hose. Both lines can be purchased at your local parts dealer.
You can look online here : http://www.rockauto.com/dbphp/mak,JEEP,2003,GRAND%20CHEROKEE%20LIMITED
Also, if it is just leaking wherre it connects, you may be able to just replace the o-ring.
Auto Mechanic
17 yrs experience and currently own and operate an Auto Repair Center