From Blabbermouth.net:
ARMORED SAINT Singer was asked to join Metallica as SINGER?!?!
Q: Is it true you were offered the gig in METALLICA after Cliff Burton died?
Bush: I actually was invited to join the band [as the vocalist] around the "Kill 'Em All" period. It was a hard decision, but ARMORED SAINT was already up and running, and these guys (in SAINT) were my childhood friends. Who knows what would have happened if I had? I don't think about it much. Joey (Vera, SAINT bassist) was one of the bassists that were asked to audition after Cliff passed, but never did.
ARMORED SAINT performing at the Key Club in Hollywood, California on March 6, 2009: