A WITNESS within the Madeleine McCann probe is to sue discredited Portuguese cop Goncalo Amaral for defamation.
HGV driver Helge Busching, 49, recognized prime suspect Christian B, 44, to cops.
His proof helped nail the convicted paedophile of a rape in Portugal in 2005 near the place Madeleine vanished in 2007, aged three.
Amaral — thrown off the case after wrongly figuring out mother and father Kate and Gerry as suspects — branded German Busching and a pal “unreliable witnesses” in a ebook.
Busching instructed The Solar: “I’m not proud of what has been mentioned about me by this policeman.”
His lawyer, George Tzeriz, mentioned the criticism was “unjustified and unwarranted”.
He mentioned: “He’s a key witness on this investigation and is seen so by the police.”