Air carrier pilot flying into TLV reported GPS Jamming.

Narrative

On the ILS to Runway 12 in Tel Aviv; I was flying in LNAV/VNAV; waiting for the LOC and GS to capture. The PFD showed us on course and we were on VNAV path. an ongoing issue in Tel Aviv is GPS jamming; and we had already had an ATC fault EICAS message. We were aware that we may additional alerts; and had briefed it accordingly. The ILS was followed by the GODED2 star; and out actual navigational performance (ANP) was fine throughout. Then; within less than a minute; the FO (First Officer) noticed the ANP was worsening; we received an UNABLE RNP EICAS message; ATC radioed to tell us that it did not appear that we were established on final; and the LOC still had not captured. Because I was distracted by the RNP messages; I hadn't been looking specifically at the fact that actual localizer was drifting away rather than towards our course. I looked down at the PFD and it still showed us on course.As the weather was VMC; it was a non event; because I immediately acquired the runway; made the adjustment and landed uneventfully; but there was still a short period of complete confusion. I thought it should be reported so crews are even more aware to be cognizant of ANP during the transition from the STAR to the ILS and that they pay close attention to LOC/GS capture. Finally; I'd like to mention that I don't have much experience with the various impacts of GPS jamming on the aircraft's actual performance; but whenever I've had issues in the past with ANP being out of parameters; it is obvious on the PFD that the aircraft is OFF the approach path. Similar to entering an OFFSET; the aircraft is displayed left or right of the centerline. In this case; the PFD consistently showed us on course; which further added to the confusion. GPS jamming. Extra cognizance on STARs and the transition from the STAR to ILS in Tel Aviv.