Country music legend Glen Campbell's daughter fought back tears as she opened up to U.S. Senators about her father's Alzheimer's Disease battle in Washington, D.C. on Wednesday (24Apr13).

Ashley Campbell sat next to the Wichita Lineman hitmaker as she appealed for ongoing support for research into the memory-stealing condition, which is slowly sapping the life out of the singer/songwriter.

She told the lawmakers on Capitol Hill, "I think a person's life is comprised of memories and that's exactly what this disease takes away from you - like a memory of my dad taking me fishing in Flagstaff when I was a little girl or playing banjo with my dad while he plays guitar.

"Now when I play banjo with my dad, it's getting harder for him to follow along - and it's getting harder for him to recall my name. It's hard to come to the realisation that some day my dad might look at me and I will be absolutely nothing to him."

Campbell has recorded a final album after completing his last tour last year (12).