SIENA, Italy (Reuters) - Banco Santander
Siena public prosecutor Antonio Nastasi, who is leading the investigation, left Siena for Madrid this morning, the sources said on Tuesday, after a special request to question him there was granted.
Banco Santander declined to comment.
The Siena prosecutors are investigating Monte dei Paschi's acquisition of smaller rival Antonveneta from Santander in 2007.
Botin's questioning as a witness - one of the last steps before the main part of the investigation closes in mid-July - was scheduled for January in Siena, but Botin could not attend.
Botin has not been charged with any crime.
Apart from Botin, prosecutors have only one more witness to question before they close the investigation.
(Reporting by Siliva Ognibene and Julien Toyer; Writing by Jennifer Clark; Editing by Louise Ireland)